From 99478e1a05ca84ce4df86aecffd820fedf269a4d Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 08:17:55 -0600
Subject: [PATCH 01/12] Add JS modernization plan and Copilot instructions

- script/jsbuilder/PLAN.md: full plan for converting JS to ES modules,
  removing jQuery, and building bundles with esbuild (mirroring cssbuilder)
- .github/copilot-instructions.md: Copilot context for this repo

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .github/copilot-instructions.md |  88 +++++++++++++++++++++++
 script/jsbuilder/PLAN.md        | 123 ++++++++++++++++++++++++++++++++
 2 files changed, 211 insertions(+)
 create mode 100644 .github/copilot-instructions.md
 create mode 100644 script/jsbuilder/PLAN.md

diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
new file mode 100644
index 000000000..2ee9f5856
--- /dev/null
+++ b/.github/copilot-instructions.md
@@ -0,0 +1,88 @@
+# Copilot Instructions for PreTeXt
+
+## What is PreTeXt
+
+PreTeXt is an XML-based authoring and publishing system for STEM textbooks and academic documents. A single XML source file is transformed into multiple output formats (HTML5, LaTeX/PDF, EPUB, Braille, Jupyter notebooks, reveal.js, etc.) via XSLT stylesheets. The Python CLI orchestrates the conversion pipeline, calling external tools (LaTeX, Asymptote, SageMath, Playwright, etc.) as needed.
+
+## Repository Layout
+
+| Directory | Role |
+|-----------|------|
+| `xsl/` | XSLT 1.0 stylesheets — the core conversion engine (~72K lines) |
+| `pretext/` | Python CLI (`pretext/pretext`) and library (`pretext/lib/pretext.py`) |
+| `css/` | SCSS/CSS theming system; `script/cssbuilder/` compiles it |
+| `js/` | Client-side JavaScript for interactive HTML output |
+| `schema/` | RELAX-NG schema; `pretext.xml` is the **only** file to edit directly |
+| `examples/` | Sample PreTeXt documents (`minimal/`, `sample-article/`) |
+| `doc/` | Author and Publisher guides |
+
+## Build & Test Commands
+
+### XSLT tests
+```bash
+cd xsl/tests
+xsltproc pretext-text-utilities-test.xsl null.xml
+# Success prints "Tests complete!"; failures print error details
+```
+
+### CSS build
+```bash
+cd script/cssbuilder
+npm install        # one-time setup
+npm run build      # compiles SCSS → css/dist/
+```
+
+### Python CLI (development use)
+```bash
+# Run conversions directly via the CLI entry point:
+python3 pretext/pretext -c <component> -f <format> -s <source.xml> -p <pub.xml> -d <dest/>
+# Example: build HTML
+python3 pretext/pretext -f html -s source/main.ptx -p publication.xml -d output/
+```
+
+There is no automated test suite or CI pipeline. For Python, `pretext/module-test.py` is an informal integration example, not a test runner.
+
+## Architecture: How a Conversion Works
+
+1. **Assembly pass** — `xsl/pretext-assembly.xsl` pre-processes source XML into an "enhanced" document (resolves `xi:include`, computes IDs, etc.).
+2. **Format pass** — a format-specific stylesheet (e.g., `xsl/pretext-html.xsl`) imports the assembly and common base, then templates match elements to produce output.
+3. **Extraction passes** — `xsl/extract-*.xsl` stylesheets isolate embeddable content (LaTeX images, Asymptote diagrams, WeBWorK problems) for separate processing by external tools.
+4. **Python orchestration** — `pretext/lib/pretext.py` calls `xsltproc` and external tools in the correct sequence, manages temp directories, and assembles the final output.
+
+### XSL import hierarchy (example for HTML)
+```
+pretext-html.xsl
+  ├── pretext-assembly.xsl
+  ├── pretext-common.xsl        ← shared base templates
+  ├── pretext-runestone.xsl
+  └── html-symbols.xsl  (include, not import)
+```
+Format-specific sheets override base templates via XSLT import precedence.
+
+## Key Conventions
+
+### XSLT
+- All stylesheets use **XSLT 1.0** with EXSL extensions (`exsl`, `str`, `dyn`).
+- Internal namespace: `xmlns:pi="http://pretextbook.org/2020/pretext/internal"`.
+- Shared entity references live in `entities.ent` and are included via DOCTYPE.
+- Template names use `kebab-case`; modes are also `kebab-case` strings.
+- `pretext-common.xsl` is the base library; format sheets extend it via `<xsl:import>`.
+- `extract-*.xsl` files follow the convention of isolating one content type per file.
+
+### Python
+- **Never** use `from foo import *` or `from foo import bar`. Always `import foo` or `import foo as ALIAS` (stated explicitly in the module header).
+- Infrequently-used libraries are imported **inside functions**, not at module level.
+- All logging goes through `log = logging.getLogger('ptxlogger')`.
+- Function names follow `verb_noun()` style; private helpers use `_verb_noun()`.
+- The single library module is `pretext/lib/pretext.py` (~6300 lines); there is no split into sub-modules.
+
+### Schema
+- **Edit only `schema/pretext.xml`** (literate RELAX-NG compact notation). The `.rnc`, `.rng`, and `.xsd` files are generated via `schema/build.sh` using the `trang` tool.
+- Schematron rules for author-facing validation are in `schema/pretext.sch` / `schema/pretext-schematron.xsl`.
+
+## Development Workflow (from CONTRIBUTING.md)
+
+- Discuss changes on the [pretext-dev Google Group](https://groups.google.com/forum/#!forum/pretext-dev) **before** writing code.
+- Work on a topic branch; **rebase onto `master`** (never merge `master` into your branch).
+- Keep commits minimal — maintainers reorganize history during integration.
+- Submit via pull request; do not add commits or rebase after submission unless asked.
diff --git a/script/jsbuilder/PLAN.md b/script/jsbuilder/PLAN.md
new file mode 100644
index 000000000..9d6606da0
--- /dev/null
+++ b/script/jsbuilder/PLAN.md
@@ -0,0 +1,123 @@
+# JS Modernization Plan
+
+Modernize how PreTeXt provides JavaScript to the HTML it builds — mirroring
+the existing CSS build system (`script/cssbuilder/` → `css/dist/`).
+
+## Goals
+
+- Convert JS source files to ES modules (import/export)
+- Remove jQuery dependency (replace with vanilla DOM APIs)
+- Bundle with esbuild into `js/dist/` (pre-built files committed to repo)
+- Update XSL and Python to reference the new bundles
+- Ship pre-built dist so users without Node can still build
+
+## Bundle Targets
+
+| Bundle | Source files | When loaded | Output |
+|--------|-------------|-------------|--------|
+| `pretext-core` | `pretext.js`, `pretext_add_on.js`, `knowl.js`, `lti_iframe_resizer.js` | Always | `js/dist/pretext-core.js` |
+| `pretext-search` | `pretext_search.js`, `ptx_search.js` | `$has-native-search` only | `js/dist/pretext-search.js` |
+
+## Out of Scope
+
+These are left untouched:
+
+- `js/pretext-webwork/` — versioned, complex server integration
+- `js/pretext-stack/` — specialized server integration
+- `js/diagcess/` — already an npm-bundled package
+- `js/mathjaxknowl3.js` — loaded dynamically by MathJax via
+  `"paths": {"pretext": "_static/pretext/js"}`; must stay a standalone file
+
+## Final Directory Structure
+
+```
+js/
+├── pretext.js               ← ES module source
+├── pretext_add_on.js        ← ES module source
+├── knowl.js                 ← ES module source
+├── lti_iframe_resizer.js    ← ES module source
+├── pretext_search.js        ← ES module source
+├── ptx_search.js            ← ES module source
+├── mathjaxknowl3.js         ← unchanged (MathJax extension)
+├── pretext-webwork/         ← unchanged
+├── pretext-stack/           ← unchanged
+├── diagcess/                ← unchanged
+└── dist/
+    ├── pretext-core.js      ← built bundle (committed)
+    ├── pretext-core.js.map
+    ├── pretext-search.js    ← built bundle (committed)
+    └── pretext-search.js.map
+
+script/jsbuilder/            ← new (this directory)
+├── package.json
+├── jsbuilder.mjs
+├── README.md
+└── PLAN.md                  ← this file
+```
+
+`js/jquery.min.js` is deleted once jQuery is removed from all source files.
+
+## jQuery → Vanilla DOM Cheatsheet
+
+| jQuery | Vanilla |
+|--------|---------|
+| `$(fn)` / `$(document).ready(fn)` | `document.addEventListener('DOMContentLoaded', fn)` |
+| `$('.sel')` | `document.querySelectorAll('.sel')` |
+| `$(el)` wrapping | work directly on `el` |
+| `$el.addClass/removeClass/toggleClass` | `el.classList.add/remove/toggle` |
+| `$el.on/off` | `el.addEventListener/removeEventListener` |
+| `$el.attr(k, v)` / `$el.prop` | `el.setAttribute(k, v)` / `el.getAttribute(k)` |
+| `$el.find('.sel')` | `el.querySelectorAll('.sel')` |
+| `$el.closest('.sel')` | `el.closest('.sel')` (native) |
+| `$el.html(s)` | `el.innerHTML = s` |
+| `$el.text(s)` | `el.textContent = s` |
+| `$el.show()` / `$el.hide()` | `el.style.display = ''` / `'none'` |
+| `$el.slideUp()` / `slideDown()` | CSS `max-height` transition or Web Animations API |
+| `$el.append(child)` | `el.append(child)` (native) |
+| `$el.prepend(child)` | `el.prepend(child)` (native)  |
+| `$el.remove()` | `el.remove()` (native) |
+| `$.ajax(...)` | `fetch(...)` |
+| `$el.trigger('click')` | `el.dispatchEvent(new Event('click'))` |
+| `$el.data(k, v)` | `el.dataset.k = v` |
+
+## Tasks (in order)
+
+### Phase 1 — Build infrastructure
+- [ ] Create `script/jsbuilder/package.json` (esbuild dep, build/watch scripts)
+- [ ] Create `script/jsbuilder/jsbuilder.mjs` (two entry points, output to `js/dist/`)
+- [ ] Create `script/jsbuilder/README.md`
+
+### Phase 2 — ES module conversion + jQuery removal
+Each file: add `import`/`export`, remove jQuery, replace with vanilla DOM.
+
+- [ ] `js/pretext.js` (261 lines — TOC, sidebar, hash nav)
+- [ ] `js/knowl.js` (338 lines — slide animations → CSS transitions)
+- [ ] `js/lti_iframe_resizer.js` (54 lines — likely minimal jQuery)
+- [ ] `js/pretext_search.js` (315 lines) + `js/ptx_search.js` (112 lines)
+- [ ] `js/pretext_add_on.js` (1,339 lines — largest; image magnify, permalink, GeoGebra)
+
+### Phase 3 — Bundle entry points
+- [ ] `js/pretext-core-entry.js` — imports + inits core modules
+- [ ] `js/pretext-search-entry.js` — imports + inits search modules
+
+### Phase 4 — Build and commit dist
+- [ ] Run `npm run build` in `script/jsbuilder/`
+- [ ] Commit `js/dist/` pre-built files
+- [ ] Delete `js/jquery.min.js`
+
+### Phase 5 — XSL update (`xsl/pretext-html.xsl`)
+- [ ] `pretext-js` template: replace 3 `<script>` tags → 1 loading `dist/pretext-core.js`
+- [ ] `native-search-box-js` template: load `dist/pretext-search.js` instead
+- [ ] Remove `lti_iframe_resizer.js` standalone tag (now in core bundle)
+- [ ] Keep MathJax loader path `"pretext": "_static/pretext/js"` unchanged
+
+### Phase 6 — Python update (`pretext/lib/pretext.py`)
+- [ ] Ensure JS file copy to `_static/pretext/js/` includes `dist/` subdirectory
+- [ ] Verify `mathjaxknowl3.js`, `pretext-webwork/`, `pretext-stack/`, `diagcess/` still copied
+
+## Notes
+
+- `ptx_search.js` may be mergeable into `pretext_search.js` — evaluate during conversion
+- The `pretext_add_on.js?x=1` cache-buster query string can be dropped with named bundles
+- The `$b-debug-react` XSL branch in `pretext-js` template is unrelated — leave untouched
+- `script/jsbuilder/node_modules` should be in `.gitignore`

From df8486e99b898ef6442c6cac9500e41384e073a4 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:01:12 -0600
Subject: [PATCH 02/12] Update JS modernization plan with validated findings

- Corrected line counts and jQuery status per file
- Documented dead/broken code (ptx_search.js, video magnify, knowl_focus_stack)
- Added modular structure: js/src/ with focused modules
- Reorganized phases: modularize first, then convert standalone files
- Added js/src/deprecated/ for flagged dead code

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 script/jsbuilder/PLAN.md | 168 +++++++++++++++++++++++++++++----------
 1 file changed, 124 insertions(+), 44 deletions(-)

diff --git a/script/jsbuilder/PLAN.md b/script/jsbuilder/PLAN.md
index 9d6606da0..02ffec00b 100644
--- a/script/jsbuilder/PLAN.md
+++ b/script/jsbuilder/PLAN.md
@@ -5,18 +5,48 @@ the existing CSS build system (`script/cssbuilder/` → `css/dist/`).
 
 ## Goals
 
-- Convert JS source files to ES modules (import/export)
-- Remove jQuery dependency (replace with vanilla DOM APIs)
+- Break the monolithic `pretext_add_on.js` into focused, maintainable modules
+- Convert all JS source files to ES modules (import/export)
+- Remove jQuery dependency (only `pretext_add_on.js` still uses it — ~35 calls)
 - Bundle with esbuild into `js/dist/` (pre-built files committed to repo)
 - Update XSL and Python to reference the new bundles
 - Ship pre-built dist so users without Node can still build
+- Flag suspected dead code for future removal
+
+## Current State (validated April 2026)
+
+**jQuery status by file:**
+| File | Lines | jQuery? | Notes |
+|------|-------|---------|-------|
+| `pretext.js` | 227 | ✅ Clean | Vanilla DOM already |
+| `knowl.js` | 286 | ✅ Clean | Vanilla DOM already |
+| `lti_iframe_resizer.js` | 50 | ✅ Clean | Vanilla DOM already |
+| `pretext_search.js` | 296 | ✅ Clean | Vanilla DOM already |
+| `ptx_search.js` | 104 | ✅ Clean | ⚠️ **Dead code** — never loaded in HTML output |
+| `pretext_add_on.js` | 1,234 | ❌ ~35 calls | Only file needing jQuery removal |
+
+**Dead / broken code identified:**
+| Code | Location | Status | Reason |
+|------|----------|--------|--------|
+| `ptx_search.js` | entire file | **Dead** | Never loaded in HTML; `pretext_search.js` handles all search |
+| `knowl_focus_stack` ESC handler | `pretext_add_on.js:366-374` | **Broken** | References globals that don't exist — would throw `ReferenceError` |
+| Video magnification | `pretext_add_on.js:192-259` | **Dead** | Selector `body iframeXXXX` intentionally matches nothing |
+| ENTER/ESC switch fallthrough | `pretext_add_on.js:353-358` | **Bug** | Case 13 (ENTER) has no `break`, falls through to case 27 (ESC) |
+| Auto-ID generation | `pretext_add_on.js:142-190` | **Suspicious** | Heavy console.log spam; unclear if output uses generated IDs |
+
+**Cross-file dependencies:**
+- `pretext_add_on.js` → `knowl.js`: references `knowl_focus_stack` (broken — var doesn't exist)
+- `pretext_add_on.js` → `MathJax`: calls `MathJax.typesetPromise()` (external lib)
+- `pretext_add_on.js` → `GeoGebra`: dynamically injects GeoGebra script
+- `pretext_search.js` → `lunr`: uses `ptx_lunr_idx` and `ptx_lunr_docs` globals from generated index
+- All files are plain scripts with no `import`/`export`; rely on global scope
 
 ## Bundle Targets
 
-| Bundle | Source files | When loaded | Output |
-|--------|-------------|-------------|--------|
-| `pretext-core` | `pretext.js`, `pretext_add_on.js`, `knowl.js`, `lti_iframe_resizer.js` | Always | `js/dist/pretext-core.js` |
-| `pretext-search` | `pretext_search.js`, `ptx_search.js` | `$has-native-search` only | `js/dist/pretext-search.js` |
+| Bundle | Source modules | When loaded | Output |
+|--------|--------------|-------------|--------|
+| `pretext-core` | `js/src/` modules + `pretext.js`, `knowl.js`, `lti_iframe_resizer.js` | Always | `js/dist/pretext-core.js` |
+| `pretext-search` | `pretext_search.js` | `$has-native-search` only | `js/dist/pretext-search.js` |
 
 ## Out of Scope
 
@@ -28,31 +58,54 @@ These are left untouched:
 - `js/mathjaxknowl3.js` — loaded dynamically by MathJax via
   `"paths": {"pretext": "_static/pretext/js"}`; must stay a standalone file
 
-## Final Directory Structure
+## Module Structure
+
+`pretext_add_on.js` (1,234 lines) is broken into focused modules under `js/src/`:
 
 ```
 js/
-├── pretext.js               ← ES module source
-├── pretext_add_on.js        ← ES module source
-├── knowl.js                 ← ES module source
-├── lti_iframe_resizer.js    ← ES module source
-├── pretext_search.js        ← ES module source
-├── ptx_search.js            ← ES module source
-├── mathjaxknowl3.js         ← unchanged (MathJax extension)
-├── pretext-webwork/         ← unchanged
-├── pretext-stack/           ← unchanged
-├── diagcess/                ← unchanged
+├── src/                          ← NEW: ES module sources
+│   ├── permalink.js              ← permalink copy-to-clipboard (lines 44–116)
+│   ├── image-magnify.js          ← image popup magnification (lines 119–140)
+│   ├── geogebra.js               ← GeoGebra calculator integration (lines 291–344)
+│   ├── keyboard-nav.js           ← ESC/ENTER key handlers (lines 347–408)
+│   ├── print-preview/            ← worksheet/handout print system (~565 lines)
+│   │   ├── index.js              ← init + controls (lines 1018–1178)
+│   │   ├── pages.js              ← page creation & adjustment (lines 459–590)
+│   │   ├── headers-footers.js    ← header/footer management (lines 593–661)
+│   │   ├── workspace.js          ← workspace height adjustment (lines 666–730, 867–909)
+│   │   ├── page-breaks.js        ← DP page-break algorithm (lines 788–834)
+│   │   ├── geometry.js           ← page geometry CSS + unit conversion (lines 837–865, 998–1016)
+│   │   ├── paper-size.js         ← paper size detection + geolocation (lines 911–944)
+│   │   ├── section-swap.js       ← printout section loading (lines 947–975)
+│   │   └── solutions.js          ← details → div rewriting (lines 977–995)
+│   ├── theme.js                  ← dark/light mode management (lines 1183–1248)
+│   ├── embed.js                  ← embed code + share button + embed mode (lines 1250–1310)
+│   ├── code-copy.js              ← code block copy button (lines 1312–1339)
+│   └── deprecated/               ← flagged for future removal
+│       ├── video-magnify.js      ← ⚠️ DEAD: selector `iframeXXXX` matches nothing
+│       ├── auto-id.js            ← ⚠️ SUSPICIOUS: heavy console spam, unclear utility
+│       └── scrollbar-width.js    ← utility only used by GeoGebra; may be replaceable
+├── pretext.js                    ← ES module (already jQuery-free)
+├── knowl.js                      ← ES module (already jQuery-free)
+├── lti_iframe_resizer.js         ← ES module (already jQuery-free)
+├── pretext_search.js             ← ES module (already jQuery-free)
+├── ptx_search.js                 ← ⚠️ DEAD: kept but not bundled
+├── mathjaxknowl3.js              ← unchanged (MathJax extension)
+├── pretext-webwork/              ← unchanged
+├── pretext-stack/                ← unchanged
+├── diagcess/                     ← unchanged
 └── dist/
-    ├── pretext-core.js      ← built bundle (committed)
+    ├── pretext-core.js           ← built bundle (committed)
     ├── pretext-core.js.map
-    ├── pretext-search.js    ← built bundle (committed)
+    ├── pretext-search.js         ← built bundle (committed)
     └── pretext-search.js.map
 
-script/jsbuilder/            ← new (this directory)
+script/jsbuilder/                 ← new (this directory)
 ├── package.json
 ├── jsbuilder.mjs
 ├── README.md
-└── PLAN.md                  ← this file
+└── PLAN.md                       ← this file
 ```
 
 `js/jquery.min.js` is deleted once jQuery is removed from all source files.
@@ -84,40 +137,67 @@ script/jsbuilder/            ← new (this directory)
 
 ### Phase 1 — Build infrastructure
 - [ ] Create `script/jsbuilder/package.json` (esbuild dep, build/watch scripts)
-- [ ] Create `script/jsbuilder/jsbuilder.mjs` (two entry points, output to `js/dist/`)
+- [ ] Create `script/jsbuilder/jsbuilder.mjs` (entry points, output to `js/dist/`)
 - [ ] Create `script/jsbuilder/README.md`
 
-### Phase 2 — ES module conversion + jQuery removal
-Each file: add `import`/`export`, remove jQuery, replace with vanilla DOM.
-
-- [ ] `js/pretext.js` (261 lines — TOC, sidebar, hash nav)
-- [ ] `js/knowl.js` (338 lines — slide animations → CSS transitions)
-- [ ] `js/lti_iframe_resizer.js` (54 lines — likely minimal jQuery)
-- [ ] `js/pretext_search.js` (315 lines) + `js/ptx_search.js` (112 lines)
-- [ ] `js/pretext_add_on.js` (1,339 lines — largest; image magnify, permalink, GeoGebra)
-
-### Phase 3 — Bundle entry points
-- [ ] `js/pretext-core-entry.js` — imports + inits core modules
-- [ ] `js/pretext-search-entry.js` — imports + inits search modules
-
-### Phase 4 — Build and commit dist
+### Phase 2 — Modularize `pretext_add_on.js`
+Break the monolith into `js/src/` modules. Remove jQuery (~35 calls, concentrated
+in image-magnify, auto-id, video-magnify, GeoGebra, and keyboard-nav sections).
+Fix known bugs (ENTER/ESC fallthrough, broken `knowl_focus_stack` reference).
+
+- [ ] Create `js/src/permalink.js`
+- [ ] Create `js/src/image-magnify.js` (remove jQuery)
+- [ ] Create `js/src/geogebra.js` (remove jQuery — heaviest: ~9 calls)
+- [ ] Create `js/src/keyboard-nav.js` (remove jQuery, fix ESC/ENTER bug, fix broken knowl_focus_stack ref)
+- [ ] Create `js/src/print-preview/` (9 sub-modules — already jQuery-free)
+- [ ] Create `js/src/theme.js`
+- [ ] Create `js/src/embed.js`
+- [ ] Create `js/src/code-copy.js`
+- [ ] Create `js/src/deprecated/video-magnify.js` (flagged dead)
+- [ ] Create `js/src/deprecated/auto-id.js` (flagged suspicious, remove jQuery)
+- [ ] Create `js/src/deprecated/scrollbar-width.js`
+
+### Phase 3 — Convert existing standalone files to ES modules
+These are already jQuery-free; just add `import`/`export` and clean up globals.
+
+- [ ] `js/pretext.js` (227 lines — TOC, sidebar, hash nav)
+- [ ] `js/knowl.js` (286 lines — knowl open/close)
+- [ ] `js/lti_iframe_resizer.js` (50 lines — LTI message handler)
+- [ ] `js/pretext_search.js` (296 lines — search UI)
+
+### Phase 4 — Bundle entry points + build
+- [ ] Create `js/src/pretext-core-entry.js` — imports + inits all core modules
+- [ ] Create `js/src/pretext-search-entry.js` — imports + inits search
 - [ ] Run `npm run build` in `script/jsbuilder/`
 - [ ] Commit `js/dist/` pre-built files
 - [ ] Delete `js/jquery.min.js`
 
 ### Phase 5 — XSL update (`xsl/pretext-html.xsl`)
-- [ ] `pretext-js` template: replace 3 `<script>` tags → 1 loading `dist/pretext-core.js`
-- [ ] `native-search-box-js` template: load `dist/pretext-search.js` instead
-- [ ] Remove `lti_iframe_resizer.js` standalone tag (now in core bundle)
+- [ ] `pretext-js` template (line ~13869): replace 3 `<script>` tags → 1 loading `dist/pretext-core.js`
+- [ ] Wherever `knowl.js` is loaded: remove standalone tag (now in core bundle)
+- [ ] Wherever `lti_iframe_resizer.js` is loaded: remove standalone tag (now in core bundle)
+- [ ] `native-search-box-js` template (line ~13758): load `dist/pretext-search.js` instead
 - [ ] Keep MathJax loader path `"pretext": "_static/pretext/js"` unchanged
+- [ ] The `$b-debug-react` XSL branch is unrelated — leave untouched
 
 ### Phase 6 — Python update (`pretext/lib/pretext.py`)
-- [ ] Ensure JS file copy to `_static/pretext/js/` includes `dist/` subdirectory
+- [ ] `copy_html_js()` (line ~6021): uses `shutil.copytree` on entire `js/` dir —
+  verify `js/dist/` is included and `js/src/` can optionally be excluded
 - [ ] Verify `mathjaxknowl3.js`, `pretext-webwork/`, `pretext-stack/`, `diagcess/` still copied
 
 ## Notes
 
-- `ptx_search.js` may be mergeable into `pretext_search.js` — evaluate during conversion
-- The `pretext_add_on.js?x=1` cache-buster query string can be dropped with named bundles
-- The `$b-debug-react` XSL branch in `pretext-js` template is unrelated — leave untouched
-- `script/jsbuilder/node_modules` should be in `.gitignore`
+- **5 of 6 files are already jQuery-free.** Phase 2 is really about modularizing
+  and de-jQuery-ing the one remaining file (`pretext_add_on.js`).
+- `ptx_search.js` is dead code (never loaded in HTML output). Kept in repo but
+  not included in any bundle.
+- The `pretext_add_on.js?x=1` cache-buster query string is dropped with named bundles.
+- `script/jsbuilder/node_modules` is already covered by `**/**/node_modules/` in `.gitignore`.
+- `pretext_search.js` expects `ptx_lunr_idx` and `ptx_lunr_docs` as globals injected by
+  the generated `lunr-pretext-search-index.js` — the bundle must not try to resolve these.
+- `MathJax` and `ggbApp` are external globals — esbuild config should mark them as external.
+- The old theme (CDN-hosted at `pretextbook.org/js/`) loads different JS paths than the new
+  theme (local `_static/pretext/js/`). The XSL update should handle both paths.
+- The `copy_html_js()` Python function copies the entire `js/` dir via `shutil.copytree`,
+  so `js/dist/` will be included automatically. Consider excluding `js/src/` from the copy
+  to keep deployed output clean.

From 71cbbcbc80d30ea201beb19e3860702b29bfb828 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:05:19 -0600
Subject: [PATCH 03/12] Add jsbuilder build infrastructure (Phase 1)

Create script/jsbuilder/ mirroring the cssbuilder pattern:
- package.json: esbuild dependency, build/watch scripts, Node >=18
- jsbuilder.mjs: two bundle targets (pretext-core, pretext-search),
  CLI with --help, --list-targets, --watch, --output-directory
- README.md: usage docs and build target reference

Entry-point source files (js/src/*-entry.js) will be created in
Phase 4 after modules are extracted.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 script/jsbuilder/README.md     |  56 ++++++++++++
 script/jsbuilder/jsbuilder.mjs | 152 +++++++++++++++++++++++++++++++++
 script/jsbuilder/package.json  |  17 ++++
 3 files changed, 225 insertions(+)
 create mode 100644 script/jsbuilder/README.md
 create mode 100644 script/jsbuilder/jsbuilder.mjs
 create mode 100644 script/jsbuilder/package.json

diff --git a/script/jsbuilder/README.md b/script/jsbuilder/README.md
new file mode 100644
index 000000000..9af59ebba
--- /dev/null
+++ b/script/jsbuilder/README.md
@@ -0,0 +1,56 @@
+# JS Builder
+
+## Installing Node and Dependencies
+
+You will need to [install node](https://nodejs.org/en/download/package-manager).
+
+Install the needed dependencies by switching to the `pretext/script/jsbuilder` directory and running `npm install`.
+
+## Use
+
+To build all targets to `pretext/js/dist`, from the jsbuilder directory do:
+
+```bash
+npm run build
+```
+
+To view the help, do:
+
+```bash
+npm run build -- -h
+```
+
+Note that parameters being passed to the script must come after a `--` or they will be interpreted as parameters for npm itself.
+
+For debugging, you likely want to build one target by using:
+
+* The `-t` flag to specify a target (`pretext-core` or `pretext-search`)
+* The `-o` flag to specify an output directory (generally the `_static/pretext/js` folder of your book)
+* The `-w` flag to watch source files and rebuild on changes
+
+Example:
+
+```bash
+npm run build -- -t pretext-core -o yourbookpath/_static/pretext/js -w
+```
+
+For full help:
+
+```bash
+npm run build -- -h
+```
+
+## Build Targets
+
+| Target | Entry point | Description |
+|--------|-------------|-------------|
+| `pretext-core` | `js/src/pretext-core-entry.js` | Core JS: TOC, sidebar, knowls, permalinks, image magnify, keyboard nav, theming, code copy, etc. |
+| `pretext-search` | `js/src/pretext-search-entry.js` | Native search UI (loaded only when `$has-native-search` is true) |
+
+## Architecture
+
+Source modules live in `js/src/`. Each module exports its initialization function. The entry-point files import all modules and wire up initialization.
+
+Built bundles are committed to `js/dist/` so that users without Node.js can still build PreTeXt documents.
+
+Also see [PLAN.md](PLAN.md) for the full modernization plan.
diff --git a/script/jsbuilder/jsbuilder.mjs b/script/jsbuilder/jsbuilder.mjs
new file mode 100644
index 000000000..5812b5a7a
--- /dev/null
+++ b/script/jsbuilder/jsbuilder.mjs
@@ -0,0 +1,152 @@
+import esbuild from 'esbuild';
+import commandLineArgs from 'command-line-args';
+import commandLineUsage from 'command-line-usage';
+import path from 'path';
+import * as url from 'url';
+
+const __dirname = url.fileURLToPath(new URL('.', import.meta.url));
+const jsRoot = path.join(__dirname, '../../js/');
+
+function getOptions() {
+  const optionDefinitions = [
+    { name: 'output-directory', alias: 'o', type: String },
+    { name: 'watch', alias: 'w', type: Boolean },
+    { name: 'selected-target', alias: 't', type: String },
+    { name: 'list-targets', alias: 'l', type: Boolean },
+    { name: 'help', alias: 'h', type: Boolean },
+    { name: 'verbose', alias: 'v', type: Boolean },
+  ];
+  return commandLineArgs(optionDefinitions);
+}
+
+const helpContents = [
+  {
+    header: 'PreTeXt JS Builder',
+    content: 'Bundles PreTeXt JavaScript source modules into distribution files. By default, all targets are built to the js/dist directory.',
+  },
+  {
+    header: 'Options',
+    optionList: [
+      {
+        name: 'help',
+        description: 'Print this usage guide.',
+        alias: 'h',
+      },
+      {
+        name: 'list-targets',
+        description: 'List all build targets.',
+        alias: 'l',
+      },
+      {
+        name: 'output-directory',
+        description: 'Directory to place output in. Can be absolute or relative to the {bold pretext/script/jsbuilder/} directory.',
+        alias: 'o',
+      },
+      {
+        name: 'selected-target',
+        description: 'Which one target to build. Use {underline list-targets} to see available targets.',
+        alias: 't',
+      },
+      {
+        name: 'verbose',
+        description: 'Print extra output.',
+        alias: 'v',
+      },
+      {
+        name: 'watch',
+        description: 'Continuously watch for changes and rebuild.',
+        alias: 'w',
+      },
+    ],
+  },
+  {
+    header: 'Usage',
+    content: [
+      {
+        desc: 'Build all targets to js/dist/.',
+        example: '$ npm run build',
+      },
+      {},
+      {
+        desc: 'Build one target to a specific directory, watching for changes.',
+        example: '$ npm run build -- -t pretext-core -o /path/to/output -w',
+      },
+    ],
+  },
+];
+
+function getTargets(options) {
+  let targets = [
+    {
+      out: 'pretext-core',
+      in: path.join(jsRoot, 'src/pretext-core-entry.js'),
+    },
+    {
+      out: 'pretext-search',
+      in: path.join(jsRoot, 'src/pretext-search-entry.js'),
+    },
+  ];
+
+  if (options['selected-target']) {
+    targets = targets.filter((t) => t.out === options['selected-target']);
+    if (targets.length === 0) {
+      console.error(
+        `Target "${options['selected-target']}" not found. Use --list-targets to see available targets.`
+      );
+      process.exit(1);
+    }
+  }
+
+  return targets;
+}
+
+function getOutDir(options) {
+  if (options['output-directory']) return options['output-directory'];
+  return path.join(jsRoot, 'dist');
+}
+
+async function getESBuildConfig(options) {
+  const targets = getTargets(options);
+  const outDir = getOutDir(options);
+
+  const ctx = await esbuild.context({
+    entryPoints: targets,
+    bundle: true,
+    sourcemap: true,
+    minify: false,
+    outdir: outDir,
+    format: 'iife',
+    // External globals that are loaded separately
+    external: ['MathJax'],
+    logLevel: 'info',
+    metafile: true,
+  });
+
+  return ctx;
+}
+
+// --------------------------------------------------------------------------
+// Main
+const options = getOptions();
+
+if (options['help']) {
+  console.log(commandLineUsage(helpContents));
+} else if (options['list-targets']) {
+  const targets = getTargets({});
+  console.log('Available targets:');
+  for (const target of targets) {
+    console.log(`  ${target.out}`);
+  }
+} else {
+  const ctx = await getESBuildConfig(options);
+  if (options['verbose']) console.log('JSBuilder options', options);
+
+  if (options.watch) {
+    await ctx.watch();
+    console.log('Watching for changes...');
+  } else {
+    await ctx.rebuild();
+    await ctx.dispose();
+    console.log('JS build complete!');
+  }
+}
diff --git a/script/jsbuilder/package.json b/script/jsbuilder/package.json
new file mode 100644
index 000000000..4c052bdf6
--- /dev/null
+++ b/script/jsbuilder/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "pretext-jsbuilder",
+  "version": "1.0.0",
+  "description": "PreTeXt JavaScript Builder — bundles JS source modules into dist/ files",
+  "scripts": {
+    "build": "node ./jsbuilder.mjs",
+    "watch": "node ./jsbuilder.mjs --watch"
+  },
+  "dependencies": {
+    "command-line-args": "^6.0.0",
+    "command-line-usage": "^7.0.3",
+    "esbuild": "^0.25.0"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}

From e4ad4e24335040172a72c2be1d9a40550fa78640 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:13:06 -0600
Subject: [PATCH 04/12] Modularize pretext_add_on.js into focused ES modules
 (Phase 2)

Break the 1,340-line monolith into 19 focused modules under js/src/:

Core modules:
- permalink.js: copy-to-clipboard for permalinks
- image-magnify.js: click-to-zoom image popup (jQuery removed)
- geogebra.js: GeoGebra calculator integration (jQuery removed)
- keyboard-nav.js: ESC/ENTER key handlers + anchor-knowl nav (jQuery removed)
- theme.js: dark/light mode switching
- embed.js: LMS embed button + embed display mode
- code-copy.js: code block copy button

Print-preview subsystem (9 modules in print-preview/):
- index.js: orchestrator for print preview setup
- pages.js: page creation and adjustment
- workspace.js: workspace height management
- headers-footers.js: editable header/footer management
- page-breaks.js: DP page-break algorithm
- geometry.js: page geometry CSS + unit conversion
- paper-size.js: letter/a4 detection via geolocation
- section-swap.js: printout section loading
- solutions.js: details-to-div rewriting

Deprecated modules (flagged for future removal):
- scrollbar-width.js: only used by GeoGebra
- auto-id.js: suspicious utility with heavy console spam
- video-magnify.js: dead code (selector matches nothing)

Bug fixes in extracted modules:
- keyboard-nav.js: add missing break after case 13 (ENTER),
  preventing fallthrough to ESC handler
- keyboard-nav.js: guard knowl_focus_stack reference with
  typeof check to prevent ReferenceError
- auto-id.js: replace jQuery .prevAll() with vanilla DOM traversal

jQuery removed from: image-magnify, geogebra, keyboard-nav, auto-id
(~35 calls total). Original pretext_add_on.js left intact until Phase 4.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 js/src/code-copy.js                     |  39 +++++
 js/src/deprecated/auto-id.js            |  46 ++++++
 js/src/deprecated/scrollbar-width.js    |  29 ++++
 js/src/deprecated/video-magnify.js      |  74 ++++++++++
 js/src/embed.js                         |  77 ++++++++++
 js/src/geogebra.js                      |  78 ++++++++++
 js/src/image-magnify.js                 |  69 +++++++++
 js/src/keyboard-nav.js                  |  86 +++++++++++
 js/src/permalink.js                     |  74 ++++++++++
 js/src/print-preview/geometry.js        |  99 +++++++++++++
 js/src/print-preview/headers-footers.js | 120 ++++++++++++++++
 js/src/print-preview/index.js           | 183 ++++++++++++++++++++++++
 js/src/print-preview/page-breaks.js     |  44 ++++++
 js/src/print-preview/pages.js           | 159 ++++++++++++++++++++
 js/src/print-preview/paper-size.js      |  43 ++++++
 js/src/print-preview/section-swap.js    |  39 +++++
 js/src/print-preview/solutions.js       |  27 ++++
 js/src/print-preview/workspace.js       | 116 +++++++++++++++
 js/src/theme.js                         |  76 ++++++++++
 19 files changed, 1478 insertions(+)
 create mode 100644 js/src/code-copy.js
 create mode 100644 js/src/deprecated/auto-id.js
 create mode 100644 js/src/deprecated/scrollbar-width.js
 create mode 100644 js/src/deprecated/video-magnify.js
 create mode 100644 js/src/embed.js
 create mode 100644 js/src/geogebra.js
 create mode 100644 js/src/image-magnify.js
 create mode 100644 js/src/keyboard-nav.js
 create mode 100644 js/src/permalink.js
 create mode 100644 js/src/print-preview/geometry.js
 create mode 100644 js/src/print-preview/headers-footers.js
 create mode 100644 js/src/print-preview/index.js
 create mode 100644 js/src/print-preview/page-breaks.js
 create mode 100644 js/src/print-preview/pages.js
 create mode 100644 js/src/print-preview/paper-size.js
 create mode 100644 js/src/print-preview/section-swap.js
 create mode 100644 js/src/print-preview/solutions.js
 create mode 100644 js/src/print-preview/workspace.js
 create mode 100644 js/src/theme.js

diff --git a/js/src/code-copy.js b/js/src/code-copy.js
new file mode 100644
index 000000000..da25dd0b0
--- /dev/null
+++ b/js/src/code-copy.js
@@ -0,0 +1,39 @@
+/**
+ * Code block copy-to-clipboard button.
+ *
+ * Wraps `.clipboardable` elements with a container and injects a copy
+ * button.  Clicking the button copies the `<pre>` content.
+ */
+
+export function initCodeCopyButtons() {
+    const elements = document.querySelectorAll(".clipboardable");
+    for (const el of elements) {
+        const div = document.createElement("div");
+        div.classList.add("clipboardable");
+        el.classList.remove("clipboardable");
+        el.replaceWith(div);
+        div.insertAdjacentElement("afterbegin", el);
+        div.insertAdjacentHTML(
+            "beforeend",
+            `
+    <button class="code-copy" title="Copy code" role="button" aria-label="Copy code" >
+        <span class="copyicon material-symbols-outlined">content_copy</span>
+        <span class="checkmark material-symbols-outlined">check</span>
+    </button>
+            `.trim()
+        );
+    }
+}
+
+export function initCodeCopyHandler() {
+    document.addEventListener("click", (ev) => {
+        const codeBox = ev.target.closest(".clipboardable");
+        if (!navigator.clipboard || !codeBox) return;
+        const button = ev.target.closest(".code-copy");
+        if (!button) return;
+        const preContent = codeBox.querySelector("pre").textContent;
+        navigator.clipboard.writeText(preContent);
+        button.classList.toggle("copied");
+        setTimeout(() => button.classList.toggle("copied"), 1000);
+    });
+}
diff --git a/js/src/deprecated/auto-id.js b/js/src/deprecated/auto-id.js
new file mode 100644
index 000000000..cb0f9d9a8
--- /dev/null
+++ b/js/src/deprecated/auto-id.js
@@ -0,0 +1,46 @@
+/**
+ * Auto-ID generation for paragraphs without IDs.
+ *
+ * ⚠️ DEPRECATED / SUSPICIOUS: Generates IDs like "base-id-part2", "base-id-part3"
+ * for <p> elements that lack an id, based on the nearest preceding <p> that has one.
+ * Produces heavy console.log output. It is unclear whether any downstream code
+ * depends on the generated IDs.
+ */
+
+export function initAutoId() {
+    const noIdParagraphs = document.querySelectorAll(".main p:not([id])");
+    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {
+        const e = noIdParagraphs[n];
+        if (e.hasAttribute("id")) continue;
+        if (e.classList.contains("watermark")) continue;
+
+        // Find all preceding sibling <p> elements
+        const prevParagraphs = [];
+        let sibling = e.previousElementSibling;
+        while (sibling) {
+            if (sibling.tagName === "P") {
+                prevParagraphs.push(sibling);
+            }
+            sibling = sibling.previousElementSibling;
+        }
+
+        if (prevParagraphs.length === 0) continue;
+
+        let partsFound = 1;
+        const partsToId = [e];
+        for (let i = 0; i < prevParagraphs.length; ++i) {
+            const thisPrevious = prevParagraphs[i];
+            if (!thisPrevious.hasAttribute("id")) {
+                partsToId.unshift(thisPrevious);
+            } else {
+                const baseId = thisPrevious.id;
+                for (let j = 0; j < partsToId.length; ++j) {
+                    ++partsFound;
+                    const nextId = baseId + "-part" + partsFound.toString();
+                    partsToId[j].setAttribute("id", nextId);
+                }
+                break;
+            }
+        }
+    }
+}
diff --git a/js/src/deprecated/scrollbar-width.js b/js/src/deprecated/scrollbar-width.js
new file mode 100644
index 000000000..e2f304c46
--- /dev/null
+++ b/js/src/deprecated/scrollbar-width.js
@@ -0,0 +1,29 @@
+/**
+ * Scrollbar width detection utility.
+ *
+ * ⚠️ DEPRECATED: Only used by the GeoGebra calculator integration.
+ * Consider replacing with a CSS-based approach in the future.
+ *
+ * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript
+ */
+
+export function getScrollbarWidth() {
+    const outer = document.createElement("div");
+    outer.style.visibility = "hidden";
+    outer.style.width = "100px";
+    outer.style.msOverflowStyle = "scrollbar"; // needed for WinJS apps
+
+    document.body.appendChild(outer);
+
+    const widthNoScroll = outer.offsetWidth;
+    outer.style.overflow = "scroll";
+
+    const inner = document.createElement("div");
+    inner.style.width = "100%";
+    outer.appendChild(inner);
+
+    const widthWithScroll = inner.offsetWidth;
+    outer.parentNode.removeChild(outer);
+
+    return widthNoScroll - widthWithScroll;
+}
diff --git a/js/src/deprecated/video-magnify.js b/js/src/deprecated/video-magnify.js
new file mode 100644
index 000000000..4bce5ffed
--- /dev/null
+++ b/js/src/deprecated/video-magnify.js
@@ -0,0 +1,74 @@
+/**
+ * Video magnification (resize YouTube iframes to full browser width).
+ *
+ * ⚠️ DEAD CODE: The selector `body iframeXXXX` intentionally matches no
+ * elements.  This module is preserved for reference but has no effect.
+ */
+
+export function initVideoMagnify() {
+    const allIframes = document.querySelectorAll("body iframeXXXX");
+    for (let i = 0; i < allIframes.length; i++) {
+        const thisItem = allIframes[i];
+        const thisItemSrc = thisItem.src;
+        if (!thisItemSrc.includes("youtube")) continue;
+
+        const thisItemId = thisItem.id;
+        const thisItemWidth = thisItem.width;
+        const thisItemHeight = thisItem.height;
+        if (thisItemHeight < 150) continue;
+
+        const emptyDiv = document.createElement("div");
+        const videomagContainer = document.createElement("div");
+        const parentTag = thisItem.parentElement.tagName;
+        if (parentTag === "FIGURE") {
+            videomagContainer.setAttribute("class", "videobig");
+        } else {
+            videomagContainer.setAttribute("class", "videobig nofigure");
+        }
+        videomagContainer.setAttribute("video-id", thisItemId);
+        videomagContainer.setAttribute("data-width", thisItemWidth);
+        videomagContainer.setAttribute("data-height", thisItemHeight);
+        videomagContainer.innerHTML = "fit width";
+
+        thisItem.insertAdjacentElement("beforebegin", emptyDiv);
+        thisItem.insertAdjacentElement("beforebegin", videomagContainer);
+        thisItem.insertAdjacentElement("beforebegin", emptyDiv);
+    }
+
+    // Toggle handlers
+    document.body.addEventListener("click", function (event) {
+        const bigBtn = event.target.closest(".videobig");
+        if (bigBtn) {
+            const videoId = bigBtn.getAttribute("video-id");
+            const video = document.getElementById(videoId);
+            const originalWidth = parseInt(bigBtn.getAttribute("data-width"));
+            const originalHeight = parseInt(bigBtn.getAttribute("data-height"));
+            const browserWidth = window.innerWidth;
+            const widthRatio = browserWidth / originalWidth;
+
+            video.setAttribute("width", widthRatio * originalWidth);
+            video.setAttribute("height", widthRatio * originalHeight);
+            video.setAttribute(
+                "style",
+                "position:relative; left:-260px; z-index:1000"
+            );
+            bigBtn.setAttribute("class", "videosmall");
+            bigBtn.innerHTML = "make small";
+            return;
+        }
+
+        const smallBtn = event.target.closest(".videosmall");
+        if (smallBtn) {
+            const videoId = smallBtn.getAttribute("video-id");
+            const video = document.getElementById(videoId);
+            const originalWidth = smallBtn.getAttribute("data-width");
+            const originalHeight = smallBtn.getAttribute("data-height");
+
+            video.removeAttribute("style");
+            video.setAttribute("width", originalWidth);
+            video.setAttribute("height", originalHeight);
+            smallBtn.setAttribute("class", "videobig");
+            smallBtn.innerHTML = "fit width";
+        }
+    });
+}
diff --git a/js/src/embed.js b/js/src/embed.js
new file mode 100644
index 000000000..ff684b2b7
--- /dev/null
+++ b/js/src/embed.js
@@ -0,0 +1,77 @@
+/**
+ * Embed/share button and embed-mode display.
+ *
+ * Provides the "embed in LMS" button that copies an <iframe> snippet,
+ * and strips chrome when the page is loaded in embed mode (?embed).
+ */
+
+import { setDarkMode } from "./theme.js";
+
+export function initShareButton() {
+    const shareButton = document.getElementById("embed-button");
+    if (!shareButton) return;
+
+    const sharePopup = document.getElementById("embed-popup");
+    const embedCode =
+        "<iframe src='" +
+        window.location.href +
+        "?embed' width='100%' height='1000px' frameborder='0'></iframe>";
+    const embedTextbox = document.getElementById("embed-code-textbox");
+    if (embedTextbox) {
+        embedTextbox.value = embedCode;
+    }
+
+    shareButton.addEventListener("click", function () {
+        sharePopup.classList.toggle("hidden");
+    });
+
+    const copyButton = document.getElementById("copy-embed-button");
+    if (copyButton) {
+        copyButton.addEventListener("click", function () {
+            const textbox = document.getElementById("embed-code-textbox");
+            if (textbox) {
+                navigator.clipboard
+                    .writeText(embedCode)
+                    .then(() => {
+                        console.log("Embed code copied to clipboard!");
+                    })
+                    .catch((err) => {
+                        console.error("Failed to copy embed code: ", err);
+                    });
+                copyButton.querySelector(".icon").innerText =
+                    "library_add_check";
+                setTimeout(function () {
+                    copyButton.querySelector(".icon").innerText =
+                        "content_copy";
+                    sharePopup.classList.add("hidden");
+                }, 450);
+            }
+        });
+    }
+}
+
+export function initEmbedMode() {
+    const urlParams = new URLSearchParams(window.location.search);
+    if (!urlParams.has("embed")) return;
+
+    // Set dark mode based on value of param
+    if (urlParams.get("embed") === "dark") {
+        setDarkMode(true);
+    } else {
+        setDarkMode(false);
+    }
+
+    const elemsToHide = [
+        "ptx-navbar",
+        "ptx-masthead",
+        "ptx-page-footer",
+        "ptx-sidebar",
+        "ptx-content-footer",
+    ];
+    for (const id of elemsToHide) {
+        const elem = document.getElementById(id);
+        if (elem) {
+            elem.classList.add("hidden");
+        }
+    }
+}
diff --git a/js/src/geogebra.js b/js/src/geogebra.js
new file mode 100644
index 000000000..d4c1f6e76
--- /dev/null
+++ b/js/src/geogebra.js
@@ -0,0 +1,78 @@
+/**
+ * GeoGebra calculator integration.
+ *
+ * Manages the floating GeoGebra calculator overlay: toggling visibility,
+ * preventing body scroll while hovering the canvas, and injecting the
+ * GeoGebra applet script on first open.
+ */
+
+import { getScrollbarWidth } from "./deprecated/scrollbar-width.js";
+
+function calculatorOnload() {
+    const toggle = document.getElementById("calculator-toggle");
+    if (toggle) toggle.focus();
+    const inputField = document.querySelector(
+        "input.gwt-SuggestBox.TextField"
+    );
+    if (inputField) inputField.focus();
+}
+
+export function initGeoGebra() {
+    const scrollWidth = getScrollbarWidth();
+    const calcOffsetR = 5;
+    const calcOffsetB = 5;
+
+    // Prevent body scroll when hovering the GeoGebra canvas
+    document.body.addEventListener("mouseover", function (event) {
+        if (!event.target.closest("#geogebra-calculator canvas")) return;
+        document.body.style.overflow = "hidden";
+        document.documentElement.style.marginRight = "15px";
+        const container = document.getElementById("calculator-container");
+        if (container) {
+            container.style.right = calcOffsetR + scrollWidth + "px";
+            container.style.bottom = calcOffsetB + scrollWidth + "px";
+        }
+    });
+
+    document.body.addEventListener("mouseout", function (event) {
+        if (!event.target.closest("#geogebra-calculator canvas")) return;
+        document.body.style.overflow = "scroll";
+        document.documentElement.style.marginRight = "0";
+        const container = document.getElementById("calculator-container");
+        if (container) {
+            container.style.right = calcOffsetR + "px";
+            container.style.bottom = calcOffsetB + "px";
+        }
+    });
+
+    // Toggle calculator visibility
+    document.body.addEventListener("click", function (event) {
+        const toggle = event.target.closest("#calculator-toggle");
+        if (!toggle) return;
+
+        const container = document.getElementById("calculator-container");
+        if (!container) return;
+
+        if (container.style.display === "none" || !container.style.display) {
+            container.style.display = "block";
+            toggle.classList.add("open");
+            toggle.setAttribute("title", "Hide calculator");
+            toggle.setAttribute("aria-expanded", "true");
+
+            const existingScript = document.getElementById("create_ggb_calc");
+            if (!existingScript) {
+                const ggbScript = document.createElement("script");
+                ggbScript.id = "create_ggb_calc";
+                ggbScript.innerHTML = "ggbApp.inject('geogebra-calculator')";
+                document.body.appendChild(ggbScript);
+            } else {
+                calculatorOnload();
+            }
+        } else {
+            container.style.display = "none";
+            toggle.classList.remove("open");
+            toggle.setAttribute("title", "Show calculator");
+            toggle.setAttribute("aria-expanded", "false");
+        }
+    });
+}
diff --git a/js/src/image-magnify.js b/js/src/image-magnify.js
new file mode 100644
index 000000000..257feefee
--- /dev/null
+++ b/js/src/image-magnify.js
@@ -0,0 +1,69 @@
+/**
+ * Image magnification (click-to-zoom).
+ *
+ * Clicking an eligible image creates a full-width popup; clicking the
+ * popup dismisses it.  Uses event delegation on the document body.
+ */
+
+/**
+ * Walk up from `el` through ancestors, collecting those that match `selector`.
+ * Returns the *last* (outermost) match — equivalent to jQuery's
+ * `.parents(selector).last()`.
+ */
+function outermostMatchingAncestor(el, selector) {
+    let match = null;
+    let current = el.parentElement;
+    while (current) {
+        if (current.matches(selector)) {
+            match = current;
+        }
+        current = current.parentElement;
+    }
+    return match;
+}
+
+export function initImageMagnify() {
+    const imgSelector =
+        ".image-box > img:not(.draw_on_me):not(.mag_popup), " +
+        ".sbspanel > img:not(.draw_on_me):not(.mag_popup), " +
+        "figure > img:not(.draw_on_me):not(.mag_popup), " +
+        "figure > div > img:not(.draw_on_me):not(.mag_popup)";
+
+    // Click an image to magnify
+    document.body.addEventListener("click", function (event) {
+        const img = event.target.closest(imgSelector);
+        if (!img) return;
+
+        const container = document.createElement("div");
+        container.setAttribute("style", "background:#fff;");
+        container.setAttribute("class", "mag_popup_container");
+        container.innerHTML =
+            '<img src="' +
+            img.src +
+            '" style="width:100%" class="mag_popup"/>';
+
+        let placement = outermostMatchingAncestor(
+            img,
+            ".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)"
+        );
+
+        // For .cols2, even articles go inside the previous odd one
+        if (placement && placement.tagName === "ARTICLE") {
+            const prev = placement.previousElementSibling;
+            if (prev) {
+                placement = prev.firstElementChild || prev;
+            }
+        }
+
+        if (placement) {
+            placement.parentNode.insertBefore(container, placement);
+        }
+    });
+
+    // Click the big image to dismiss it
+    document.body.addEventListener("click", function (event) {
+        if (event.target.classList.contains("mag_popup")) {
+            event.target.parentNode.remove();
+        }
+    });
+}
diff --git a/js/src/keyboard-nav.js b/js/src/keyboard-nav.js
new file mode 100644
index 000000000..591d6e89e
--- /dev/null
+++ b/js/src/keyboard-nav.js
@@ -0,0 +1,86 @@
+/**
+ * Keyboard navigation handlers.
+ *
+ * - ENTER in a `.workspace` triggers MathJax typesetting.
+ * - ESC navigates back through Sage cell focus, then up the knowl stack,
+ *   or does nothing if no interactive context is active.
+ * - Hash-based anchor navigation: opens knowls linked via URL hash.
+ */
+
+let justHitEscape = false;
+
+function processWorkspace() {
+    if (typeof MathJax !== "undefined" && MathJax.typesetPromise) {
+        MathJax.typesetPromise();
+    }
+}
+
+export function initKeyboardNav() {
+    document.onkeyup = function (event) {
+        const e = event || window.event;
+        switch (e.keyCode) {
+            case 13: // ENTER
+                justHitEscape = false;
+                if (
+                    document.activeElement.classList.contains("workspace")
+                ) {
+                    processWorkspace();
+                }
+                break; // Fixed: was missing, caused fallthrough to ESC handler
+
+            case 27: // ESC
+            {
+                const parentSageCell =
+                    document.activeElement.closest(".sagecell_editor");
+                if (parentSageCell && !justHitEscape) {
+                    justHitEscape = true;
+                    setTimeout(function () {
+                        justHitEscape = false;
+                    }, 1000);
+                }
+                // knowl_focus_stack is defined in knowl.js and may not exist
+                // in all contexts — guard against ReferenceError
+                else if (
+                    typeof knowl_focus_stack !== "undefined" &&
+                    knowl_focus_stack.length > 0
+                ) {
+                    const mostRecentlyOpened = knowl_focus_stack.pop();
+                    if (typeof knowl_focus_stack_uid !== "undefined") {
+                        knowl_focus_stack_uid.pop();
+                    }
+                    mostRecentlyOpened.focus();
+                } else {
+                    break;
+                }
+                break;
+            }
+        }
+    };
+}
+
+export function initAnchorKnowl() {
+    if (!window.location.hash.length) return;
+
+    const id = window.location.hash.substring(1);
+    const anchor = document.getElementById(id);
+    if (!anchor) return;
+
+    if (anchor.tagName === "ARTICLE") {
+        const containedKnowl = anchor.querySelector("a[data-knowl]");
+        if (containedKnowl && containedKnowl.parentElement === anchor) {
+            containedKnowl.click();
+        }
+    } else if (anchor.hasAttribute("data-knowl")) {
+        anchor.click();
+    } else {
+        // If it is a hidden knowl, find the knowl and open it
+        const hiddenContent = anchor.closest(".hidden-content");
+        if (hiddenContent) {
+            const refId = hiddenContent.id;
+            const knowl = document.querySelector(
+                '[data-refid="' + refId + '"]'
+            );
+            if (knowl) knowl.click();
+        }
+    }
+}
diff --git a/js/src/permalink.js b/js/src/permalink.js
new file mode 100644
index 000000000..a94010586
--- /dev/null
+++ b/js/src/permalink.js
@@ -0,0 +1,74 @@
+/**
+ * Permalink copy-to-clipboard functionality.
+ *
+ * Copies permalink URLs to the clipboard using the Clipboard API,
+ * with a brief visual confirmation message.
+ */
+
+async function copyPermalink(linkNode) {
+    if (!navigator.clipboard) {
+        console.log("Error: Clipboard API not available");
+        return;
+    }
+    const elem = linkNode.parentElement;
+    if (!linkNode) {
+        console.log("Error: Something went wrong finding permalink URL");
+        return;
+    }
+    const url = linkNode.href;
+    const description = elem.getAttribute("data-description");
+    const link = `<a href="${url}">${description}</a>`;
+    const msgLink = `<a class="internal" href="${url}">${description}</a>`;
+    const textFallback = description + " \r\n" + url;
+    let copySuccess = true;
+
+    try {
+        // NOTE: this method will only work in Firefox if the user has
+        //    dom.events.asyncClipboard.clipboardItem
+        // set to true in their about:config.
+        await navigator.clipboard.write([
+            new ClipboardItem({
+                "text/html": new Blob([link], { type: "text/html" }),
+                "text/plain": new Blob([textFallback], { type: "text/plain" }),
+            }),
+        ]);
+    } catch (err) {
+        console.log(
+            "Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText",
+            err
+        );
+        copySuccess = false;
+    }
+
+    if (!copySuccess) {
+        try {
+            await navigator.clipboard.writeText(textFallback);
+        } catch (err) {
+            console.log(
+                "Permalink-to-clipboard using clipboard.writeText failed",
+                err
+            );
+            console.error("Failed to copy link to clipboard!");
+            return;
+        }
+    }
+
+    console.log(`copied '${url}' to clipboard`);
+    const copiedMsg = document.createElement("p");
+    copiedMsg.setAttribute("role", "alert");
+    copiedMsg.className = "permalink-alert";
+    copiedMsg.innerHTML = "Link to " + msgLink + " copied to clipboard";
+    elem.parentElement.insertBefore(copiedMsg, elem);
+    await new Promise((resolve) => setTimeout(resolve, 1500));
+    copiedMsg.remove();
+}
+
+export function initPermalinks() {
+    const permalinks = document.querySelectorAll(".autopermalink > a");
+    permalinks.forEach((link) => {
+        link.addEventListener("click", function (event) {
+            event.preventDefault();
+            copyPermalink(link);
+        });
+    });
+}
diff --git a/js/src/print-preview/geometry.js b/js/src/print-preview/geometry.js
new file mode 100644
index 000000000..9d150388e
--- /dev/null
+++ b/js/src/print-preview/geometry.js
@@ -0,0 +1,99 @@
+/**
+ * Print-preview page geometry helpers.
+ *
+ * Utilities for converting CSS units to pixels, computing element heights,
+ * and injecting dynamic @page / CSS-variable rules.
+ */
+
+export function toPixels(value) {
+    if (typeof value === "number") return value;
+    if (typeof value !== "string") return 0;
+    value = value.trim();
+    if (value.endsWith("px")) {
+        return parseFloat(value);
+    } else if (value.endsWith("in")) {
+        return Math.floor(parseFloat(value) * 96);
+    } else if (value.endsWith("cm")) {
+        return Math.floor(parseFloat(value) * 37.8);
+    } else if (value.endsWith("mm")) {
+        return Math.floor(parseFloat(value) * 3.78);
+    } else if (value.endsWith("pt")) {
+        return Math.floor(parseFloat(value) * (96 / 72));
+    } else {
+        return parseFloat(value) || 0;
+    }
+}
+
+export function getElementTotalHeight(elem) {
+    const style = getComputedStyle(elem);
+    const marginTop = parseFloat(style.marginTop);
+    const marginBottom = parseFloat(style.marginBottom);
+    const height = elem.offsetHeight;
+    return height + marginTop + marginBottom;
+}
+
+export function getElemWorkspaceHeight(elem) {
+    if (elem.classList.contains("sidebyside")) {
+        const sbspanels = elem.querySelectorAll(".sbspanel");
+        let max = 0;
+        sbspanels.forEach((panel) => {
+            const workspaces = panel.querySelectorAll(".workspace");
+            let totalHeight = 0;
+            workspaces.forEach((workspace) => {
+                const workspaceHeight = workspace.offsetHeight;
+                if (workspaceHeight) {
+                    totalHeight += workspaceHeight;
+                }
+            });
+            if (totalHeight > max) {
+                max = totalHeight;
+            }
+        });
+        return max;
+    }
+
+    let columns = 1;
+    if (elem.classList.contains("exercisegroup")) {
+        for (let i = 2; i <= 6; i++) {
+            if (elem.querySelector(`.cols${i}`)) {
+                columns = i;
+                break;
+            }
+        }
+    }
+    const workspaces = elem.querySelectorAll(".workspace");
+    let totalHeight = 0;
+    workspaces.forEach((ws) => {
+        const workspaceHeight = ws.offsetHeight;
+        if (workspaceHeight) {
+            totalHeight += workspaceHeight;
+        }
+    });
+    return totalHeight / columns;
+}
+
+export function setPageGeometryCSS({ paperSize, margins }) {
+    const existingStyle = document.getElementById("page-geometry-css");
+    if (existingStyle) {
+        existingStyle.remove();
+    }
+    const wsWidth = paperSize === "letter" ? "816px" : "794px";
+    const wsHeight = paperSize === "letter" ? "1056px" : "1123px";
+
+    const style = document.createElement("style");
+    style.id = "page-geometry-css";
+    style.textContent = `
+        :root {
+            --ws-width: ${wsWidth};
+            --ws-height: ${wsHeight};
+            --ws-top-margin: ${margins.top}px;
+            --ws-right-margin: ${margins.right}px;
+            --ws-bottom-margin: ${margins.bottom}px;
+            --ws-left-margin: ${margins.left}px;
+        }
+        @page {
+            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);
+        }
+    `;
+    document.head.appendChild(style);
+}
diff --git a/js/src/print-preview/headers-footers.js b/js/src/print-preview/headers-footers.js
new file mode 100644
index 000000000..36054d195
--- /dev/null
+++ b/js/src/print-preview/headers-footers.js
@@ -0,0 +1,120 @@
+/**
+ * Print-preview header and footer management.
+ *
+ * Adds editable header/footer divs to each page, populates them from
+ * localStorage or data attributes, and persists edits back to localStorage.
+ */
+
+export function addHeadersAndFootersToPrintout() {
+    const printout = document.querySelector(
+        "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+
+    const pages = printout.querySelectorAll(".onepage");
+    pages.forEach((page, index) => {
+        const isFirstPage = index === 0;
+
+        const headerDiv = document.createElement("div");
+        headerDiv.classList.add(
+            isFirstPage ? "first-page-header" : "running-header",
+            "hidden"
+        );
+        headerDiv.innerHTML = `<div class="header-left" contenteditable="true"></div><div class="header-center" contenteditable="true"></div><div class="header-right" contenteditable="true"></div>`;
+        page.insertBefore(headerDiv, page.firstChild);
+
+        const footerDiv = document.createElement("div");
+        footerDiv.classList.add(
+            isFirstPage ? "first-page-footer" : "running-footer",
+            "hidden"
+        );
+        footerDiv.innerHTML = `<div class="footer-left" contenteditable="true"></div><div class="footer-center" contenteditable="true"></div><div class="footer-right" contenteditable="true"></div>`;
+        page.appendChild(footerDiv);
+    });
+
+    // Populate from localStorage or data attributes
+    const keys = [
+        "header-first-left",
+        "header-first-center",
+        "header-first-right",
+        "footer-first-left",
+        "footer-first-center",
+        "footer-first-right",
+        "header-running-left",
+        "header-running-center",
+        "header-running-right",
+        "footer-running-left",
+        "footer-running-center",
+        "footer-running-right",
+    ];
+
+    const content = {};
+    keys.forEach((key) => {
+        content[key] =
+            localStorage.getItem(key) ||
+            printout.getAttribute(`data-${key}`) ||
+            "";
+    });
+
+    // First page
+    const firstHeader = document.querySelector(".first-page-header");
+    if (firstHeader) {
+        firstHeader.querySelector(".header-left").innerHTML =
+            content["header-first-left"];
+        firstHeader.querySelector(".header-center").innerHTML =
+            content["header-first-center"];
+        firstHeader.querySelector(".header-right").innerHTML =
+            content["header-first-right"];
+    }
+    const firstFooter = document.querySelector(".first-page-footer");
+    if (firstFooter) {
+        firstFooter.querySelector(".footer-left").innerHTML =
+            content["footer-first-left"];
+        firstFooter.querySelector(".footer-center").innerHTML =
+            content["footer-first-center"];
+        firstFooter.querySelector(".footer-right").innerHTML =
+            content["footer-first-right"];
+    }
+
+    // Running headers and footers
+    document.querySelectorAll(".running-header").forEach((headerDiv) => {
+        headerDiv.querySelector(".header-left").innerHTML =
+            content["header-running-left"];
+        headerDiv.querySelector(".header-center").innerHTML =
+            content["header-running-center"];
+        headerDiv.querySelector(".header-right").innerHTML =
+            content["header-running-right"];
+    });
+    document.querySelectorAll(".running-footer").forEach((footerDiv) => {
+        footerDiv.querySelector(".footer-left").innerHTML =
+            content["footer-running-left"];
+        footerDiv.querySelector(".footer-center").innerHTML =
+            content["footer-running-center"];
+        footerDiv.querySelector(".footer-right").innerHTML =
+            content["footer-running-right"];
+    });
+
+    // Persist edits to localStorage
+    const selectorMap = {
+        "header-first-left": ".first-page-header .header-left",
+        "header-first-center": ".first-page-header .header-center",
+        "header-first-right": ".first-page-header .header-right",
+        "footer-first-left": ".first-page-footer .footer-left",
+        "footer-first-center": ".first-page-footer .footer-center",
+        "footer-first-right": ".first-page-footer .footer-right",
+        "header-running-left": ".running-header .header-left",
+        "header-running-center": ".running-header .header-center",
+        "header-running-right": ".running-header .header-right",
+        "footer-running-left": ".running-footer .footer-left",
+        "footer-running-center": ".running-footer .footer-center",
+        "footer-running-right": ".running-footer .footer-right",
+    };
+    keys.forEach((key) => {
+        const elements = document.querySelectorAll(selectorMap[key]);
+        elements.forEach((elem) => {
+            elem.addEventListener("input", () => {
+                localStorage.setItem(key, elem.innerHTML);
+            });
+        });
+    });
+}
diff --git a/js/src/print-preview/index.js b/js/src/print-preview/index.js
new file mode 100644
index 000000000..e88a23e22
--- /dev/null
+++ b/js/src/print-preview/index.js
@@ -0,0 +1,183 @@
+/**
+ * Print-preview initialization and controls.
+ *
+ * Orchestrates the print-preview workflow: loading the printout section,
+ * setting up paper size controls, managing solution visibility, creating
+ * or adjusting pages, and wiring up header/footer toggles.
+ */
+
+import { toPixels, setPageGeometryCSS } from "./geometry.js";
+import {
+    adjustWorkspaceToFitPage,
+    toggleWorkspaceHighlight,
+} from "./workspace.js";
+import {
+    flattenParagraphsSections,
+    waitForImages,
+    adjustPrintoutPages,
+    createPrintoutPages,
+} from "./pages.js";
+import { addHeadersAndFootersToPrintout } from "./headers-footers.js";
+import { getPaperSize } from "./paper-size.js";
+import { loadPrintout } from "./section-swap.js";
+import { rewriteSolutions } from "./solutions.js";
+
+export async function initPrintPreview() {
+    const urlParams = new URLSearchParams(window.location.search);
+    if (!urlParams.has("printpreview")) return;
+
+    const printableSectionID = urlParams.get("printpreview");
+    await loadPrintout(printableSectionID);
+
+    // Parse margins
+    const marginList = document
+        .querySelector("section.worksheet, section.handout")
+        .getAttribute("data-margins")
+        .split(" ");
+    const margins = {
+        top: toPixels(marginList[0] || "0.75in"),
+        right: toPixels(marginList[1] || "0.75in"),
+        bottom: toPixels(marginList[2] || "0.75in"),
+        left: toPixels(marginList[3] || "0.75in"),
+    };
+
+    rewriteSolutions();
+
+    // Paper size setup
+    let paperSize = getPaperSize();
+    if (paperSize) {
+        const radio = document.querySelector(
+            `input[name="papersize"][value="${paperSize}"]`
+        );
+        if (radio) radio.checked = true;
+        document.body.classList.remove("a4", "letter");
+        document.body.classList.add(paperSize);
+        setPageGeometryCSS({ paperSize, margins });
+    }
+
+    // Paper size radio change handlers
+    const papersizeRadios = document.querySelectorAll(
+        'input[name="papersize"]'
+    );
+    papersizeRadios.forEach((radio) => {
+        radio.addEventListener("change", function () {
+            if (this.checked) {
+                document.body.classList.remove("a4", "letter");
+                document.body.classList.add(this.value);
+                localStorage.setItem("papersize", this.value);
+                setPageGeometryCSS({ paperSize: this.value, margins });
+                adjustWorkspaceToFitPage({
+                    paperSize: this.value,
+                    margins,
+                });
+            }
+        });
+    });
+
+    // Solution visibility checkboxes
+    for (const solutionType of ["hint", "answer", "solution"]) {
+        const checkbox = document.getElementById(
+            `hide-${solutionType}-checkbox`
+        );
+        if (!checkbox) continue;
+
+        const storageKey = `hide-${solutionType}`;
+        if (
+            (solutionType === "answer" || solutionType === "solution") &&
+            !localStorage.getItem(storageKey)
+        ) {
+            checkbox.checked = true;
+            localStorage.setItem(storageKey, "true");
+        }
+
+        checkbox.checked = localStorage.getItem(storageKey) === "true";
+        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {
+            if (checkbox.checked) {
+                elem.classList.add("hidden");
+            } else {
+                elem.classList.remove("hidden");
+            }
+        });
+
+        checkbox.addEventListener("change", function () {
+            localStorage.setItem(storageKey, this.checked);
+            document
+                .querySelectorAll(`div.${solutionType}`)
+                .forEach((elem) => {
+                    if (checkbox.checked) {
+                        elem.classList.add("hidden");
+                    } else {
+                        elem.classList.remove("hidden");
+                    }
+                    adjustWorkspaceToFitPage({ paperSize, margins });
+                });
+        });
+    }
+
+    // Build pages
+    const printoutSection = document.querySelector(
+        "section.worksheet, section.handout"
+    );
+    if (printoutSection) {
+        flattenParagraphsSections(printoutSection);
+        await waitForImages(printoutSection);
+    }
+
+    if (document.querySelector(".onepage")) {
+        adjustPrintoutPages();
+    } else {
+        createPrintoutPages(margins);
+    }
+
+    addHeadersAndFootersToPrintout();
+
+    // Header/footer toggle checkboxes
+    for (const hf of [
+        "first-page-header",
+        "running-header",
+        "first-page-footer",
+        "running-footer",
+    ]) {
+        const checkbox = document.getElementById(`print-${hf}-checkbox`);
+        if (!checkbox) continue;
+
+        checkbox.checked =
+            localStorage.getItem(`print-${hf}`) === "true";
+        document.querySelectorAll(`.${hf}`).forEach((elem) => {
+            if (checkbox.checked) {
+                elem.classList.remove("hidden");
+            } else {
+                elem.classList.add("hidden");
+            }
+        });
+
+        checkbox.addEventListener("change", function () {
+            localStorage.setItem(`print-${hf}`, this.checked);
+            document.querySelectorAll(`.${hf}`).forEach((elem) => {
+                if (checkbox.checked) {
+                    elem.classList.remove("hidden");
+                } else {
+                    elem.classList.add("hidden");
+                }
+                adjustWorkspaceToFitPage({ paperSize, margins });
+            });
+        });
+    }
+
+    // Adjust workspace heights
+    adjustWorkspaceToFitPage({ paperSize, margins });
+
+    // Highlight workspace checkbox
+    const highlightCheckbox = document.getElementById(
+        "highlight-workspace-checkbox"
+    );
+    if (highlightCheckbox) {
+        highlightCheckbox.checked =
+            localStorage.getItem("highlightWorkspace") === "true";
+        highlightCheckbox.addEventListener("change", function () {
+            localStorage.setItem("highlightWorkspace", this.checked);
+            toggleWorkspaceHighlight(this.checked);
+        });
+        toggleWorkspaceHighlight(highlightCheckbox.checked);
+    }
+}
diff --git a/js/src/print-preview/page-breaks.js b/js/src/print-preview/page-breaks.js
new file mode 100644
index 000000000..8af27596c
--- /dev/null
+++ b/js/src/print-preview/page-breaks.js
@@ -0,0 +1,44 @@
+/**
+ * Dynamic-programming page-break algorithm.
+ *
+ * Given a list of content blocks with heights and workspace heights,
+ * finds page-break positions that minimize leftover whitespace variance
+ * across pages.
+ */
+
+export function findPageBreaks(rows, pageHeight) {
+    let pageBreaks = [];
+    let minCost = Array(rows.length + 1).fill(Infinity);
+    minCost[rows.length] = 0;
+    let nextPageBreak = Array(rows.length).fill(-1);
+
+    for (let i = rows.length - 1; i >= 0; i--) {
+        let cumulativeHeight = 0;
+        for (let j = i; j < rows.length; j++) {
+            cumulativeHeight += rows[j].height;
+            if (cumulativeHeight > pageHeight) {
+                if (j === i) {
+                    // Single row exceeds page height — give it its own page
+                    minCost[i] = 0;
+                    nextPageBreak[i] = i + 1;
+                }
+                break;
+            }
+
+            const cost =
+                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];
+            if (cost < minCost[i]) {
+                minCost[i] = cost;
+                nextPageBreak[i] = j + 1;
+            }
+        }
+    }
+
+    // Backtrack: row 0 is always a title sharing the first page with row 1
+    let nextPage = 1;
+    while (nextPage < rows.length) {
+        pageBreaks.push(nextPageBreak[nextPage]);
+        nextPage = nextPageBreak[nextPage];
+    }
+    return pageBreaks;
+}
diff --git a/js/src/print-preview/pages.js b/js/src/print-preview/pages.js
new file mode 100644
index 000000000..06d9c6844
--- /dev/null
+++ b/js/src/print-preview/pages.js
@@ -0,0 +1,159 @@
+/**
+ * Print-preview page creation and adjustment.
+ *
+ * Handles flattening paragraph sections, waiting for images,
+ * adjusting pre-existing pages, and algorithmically creating
+ * new page divisions for printout content.
+ */
+
+import {
+    getElementTotalHeight,
+    getElemWorkspaceHeight,
+} from "./geometry.js";
+import { setInitialWorkspaceHeights } from "./workspace.js";
+import { findPageBreaks } from "./page-breaks.js";
+
+export function flattenParagraphsSections(printout) {
+    const paragraphsSections = printout.querySelectorAll(
+        "section.paragraphs"
+    );
+    paragraphsSections.forEach((section) => {
+        const parent = section.parentNode;
+        while (section.firstChild) {
+            parent.insertBefore(section.firstChild, section);
+        }
+        parent.removeChild(section);
+    });
+}
+
+export function waitForImages(container, timeoutMs = 5000) {
+    const images = container.querySelectorAll("img");
+    const promises = [];
+    for (const img of images) {
+        if (!img.complete) {
+            promises.push(
+                new Promise((resolve) => {
+                    img.addEventListener("load", resolve, { once: true });
+                    img.addEventListener("error", resolve, { once: true });
+                })
+            );
+        }
+    }
+    if (promises.length === 0) return Promise.resolve();
+    return Promise.race([
+        Promise.all(promises),
+        new Promise((resolve) => setTimeout(resolve, timeoutMs)),
+    ]);
+}
+
+export function adjustPrintoutPages() {
+    const printout = document.querySelector(
+        "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+
+    const pages = printout.querySelectorAll(".onepage");
+    if (pages.length === 0) return;
+
+    const firstPage = pages[0];
+    const lastPage = pages[pages.length - 1];
+
+    // Move all children before the first page into the first page
+    const pageFirstChild = firstPage.firstChild;
+    let currentChild = printout.firstChild;
+    while (currentChild && currentChild !== firstPage) {
+        const nextChild = currentChild.nextSibling;
+        firstPage.insertBefore(currentChild, pageFirstChild);
+        currentChild = nextChild;
+    }
+
+    // Move all children after the last page into the last page
+    let nextChild = lastPage.nextSibling;
+    while (nextChild) {
+        const tempChild = nextChild;
+        nextChild = nextChild.nextSibling;
+        lastPage.appendChild(tempChild);
+    }
+}
+
+export function createPrintoutPages(margins) {
+    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);
+    const conservativeContentWidth = 794 - (margins.left + margins.right);
+
+    const printout = document.querySelector(
+        "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+
+    printout.style.width =
+        (conservativeContentWidth + margins.left + margins.right).toString() +
+        "px";
+    setInitialWorkspaceHeights(printout);
+
+    // Build list of blocks, handling sidebyside and tasks
+    let rows = [];
+    for (const child of printout.children) {
+        if (child.classList.contains("sidebyside")) {
+            rows.push(child);
+        } else if (child.querySelector(".task")) {
+            rows.push(child);
+            const tasks = child.querySelectorAll(".task, .conclusion");
+
+            for (let i = 0; i < tasks.length; i++) {
+                let parent = tasks[i].parentElement;
+                let grandparent = parent.parentElement;
+                if (grandparent.classList.contains("task")) {
+                    tasks[i].classList.add("subsubtask");
+                } else if (parent.classList.contains("task")) {
+                    tasks[i].classList.add("subtask");
+                }
+            }
+            for (let i = tasks.length - 1; i > 0; i--) {
+                printout.insertBefore(tasks[i], child.nextSibling);
+            }
+        } else {
+            rows.push(child);
+        }
+    }
+
+    // Build block list with height info
+    let blockList = [];
+    for (const row of rows) {
+        let blockHeight = getElementTotalHeight(row);
+        if (blockHeight === 0) continue;
+
+        let totalWorkspaceHeight = 0;
+        if (row.querySelector(".workspace")) {
+            totalWorkspaceHeight = getElemWorkspaceHeight(row);
+        }
+        blockList.push({
+            elem: row,
+            height: blockHeight,
+            workspaceHeight: totalWorkspaceHeight,
+        });
+    }
+
+    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);
+
+    // Create page divs
+    for (let i = 0; i < pageBreaks.length; i++) {
+        const pageDiv = document.createElement("section");
+        pageDiv.classList.add("onepage");
+        if (i === 0) pageDiv.classList.add("firstpage");
+        if (i === pageBreaks.length - 1) pageDiv.classList.add("lastpage");
+
+        const start = pageBreaks[i - 1] || 0;
+        const end = pageBreaks[i];
+        for (let j = start; j < end; j++) {
+            pageDiv.appendChild(blockList[j].elem);
+        }
+        printout.appendChild(pageDiv);
+    }
+
+    // Remove content not in a page
+    for (const child of Array.from(printout.children)) {
+        if (!child.classList.contains("onepage")) {
+            printout.removeChild(child);
+        }
+    }
+}
diff --git a/js/src/print-preview/paper-size.js b/js/src/print-preview/paper-size.js
new file mode 100644
index 000000000..5518ae185
--- /dev/null
+++ b/js/src/print-preview/paper-size.js
@@ -0,0 +1,43 @@
+/**
+ * Paper size detection.
+ *
+ * Determines paper size (letter vs a4) from localStorage, or falls back
+ * to geographic detection via ipapi.co.
+ */
+
+export function getPaperSize() {
+    let paperSize = localStorage.getItem("papersize");
+    if (paperSize) return paperSize;
+
+    // Try to set papersize based on user's geographic region
+    try {
+        fetch("https://ipapi.co/json/")
+            .then((response) => response.json())
+            .then((data) => {
+                const continent =
+                    data && data.continent_code ? data.continent_code : "";
+                paperSize =
+                    continent === "NA" || continent === "SA"
+                        ? "letter"
+                        : "a4";
+                const radio = document.querySelector(
+                    `input[name="papersize"][value="${paperSize}"]`
+                );
+                if (radio) {
+                    radio.checked = true;
+                    localStorage.setItem("papersize", paperSize);
+                }
+                document.body.classList.remove("a4", "letter");
+                document.body.classList.add(paperSize);
+            })
+            .catch((err) => {
+                throw err;
+            });
+    } catch (e) {
+        const radio = document.querySelector(
+            'input[name="papersize"][value="letter"]'
+        );
+        if (radio) radio.checked = true;
+    }
+    return paperSize || "letter";
+}
diff --git a/js/src/print-preview/section-swap.js b/js/src/print-preview/section-swap.js
new file mode 100644
index 000000000..7a3dbda04
--- /dev/null
+++ b/js/src/print-preview/section-swap.js
@@ -0,0 +1,39 @@
+/**
+ * Printout section loading (print preview).
+ *
+ * Swaps the current page content with the target printable section
+ * and switches to the print-worksheet stylesheet.
+ */
+
+export async function loadPrintout(printableSectionID) {
+    const themeStylesheetLink = document.querySelector(
+        'link[rel="stylesheet"][href*="theme"]'
+    );
+    const themeStylesheetHref = themeStylesheetLink
+        ? themeStylesheetLink.getAttribute("href")
+        : null;
+
+    if (themeStylesheetHref) {
+        const printStylesheetHref = themeStylesheetHref.replace(
+            /theme.*\.css/,
+            "print-worksheet.css"
+        );
+        themeStylesheetLink.setAttribute("href", printStylesheetHref);
+        await new Promise((resolve) => {
+            themeStylesheetLink.addEventListener("load", resolve, {
+                once: true,
+            });
+        });
+    }
+
+    const printableSection = document.getElementById(printableSectionID);
+    if (!printableSection) {
+        console.error("No section found with ID:", printableSectionID);
+        return;
+    }
+
+    const ptxContent = document.querySelector(".ptx-content");
+    const existingSections = ptxContent.querySelectorAll(":scope > section");
+    existingSections.forEach((sec) => ptxContent.removeChild(sec));
+    ptxContent.appendChild(printableSection);
+}
diff --git a/js/src/print-preview/solutions.js b/js/src/print-preview/solutions.js
new file mode 100644
index 000000000..d92c9a08b
--- /dev/null
+++ b/js/src/print-preview/solutions.js
@@ -0,0 +1,27 @@
+/**
+ * Solution rewriting for print preview.
+ *
+ * Converts <details>/<summary> solution elements into plain <div>s
+ * with a heading, so they render properly in print layout.
+ */
+
+export function rewriteSolutions() {
+    const bornHiddenKnowls = document.querySelectorAll(
+        ".worksheet details, .handout details"
+    );
+    bornHiddenKnowls.forEach(function (detail) {
+        const summary = detail.querySelector("summary");
+        const content = detail.innerHTML.replace(summary.outerHTML, "");
+        const div = document.createElement("div");
+        div.classList = detail.classList;
+        if (summary) {
+            const title = document.createElement("h5");
+            title.innerHTML = summary.innerHTML;
+            div.appendChild(title);
+        }
+        const body = document.createElement("div");
+        body.innerHTML = content;
+        div.appendChild(body);
+        detail.parentNode.replaceChild(div, detail);
+    });
+}
diff --git a/js/src/print-preview/workspace.js b/js/src/print-preview/workspace.js
new file mode 100644
index 000000000..9165e2b28
--- /dev/null
+++ b/js/src/print-preview/workspace.js
@@ -0,0 +1,116 @@
+/**
+ * Print-preview workspace height management.
+ *
+ * Handles setting initial workspace heights from data attributes,
+ * adjusting heights to fit pages, highlighting workspace areas,
+ * and MathJax re-typesetting on workspace edits.
+ */
+
+import { getElementTotalHeight, getElemWorkspaceHeight } from "./geometry.js";
+
+export function setInitialWorkspaceHeights() {
+    const workspaces = document.querySelectorAll(".workspace");
+    workspaces.forEach((ws) => {
+        ws.style.height = ws.getAttribute("data-space") || "0px";
+        ws.setAttribute("contenteditable", "true");
+    });
+}
+
+export function adjustWorkspaceToFitPage({ paperSize, margins }) {
+    // Toggle off workspace highlight if it is on
+    const highlightCheckbox = document.getElementById(
+        "highlight-workspace-checkbox"
+    );
+    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;
+    if (wasHighlighted) {
+        toggleWorkspaceHighlight(false);
+    }
+
+    let paperWidth, paperHeight;
+    if (paperSize === "a4" || document.body.classList.contains("a4")) {
+        paperWidth = 794;
+        paperHeight = 1122.5;
+    } else {
+        paperWidth = 816;
+        paperHeight = 1056;
+    }
+    const paperContentHeight = paperHeight - (margins.top + margins.bottom);
+
+    setInitialWorkspaceHeights();
+
+    const pages = document.querySelectorAll(".onepage");
+    pages.forEach((page) => {
+        page.style.width = paperWidth + "px";
+        const rows = page.children;
+        let totalContentHeight = 0;
+        let totalWorkspaceHeight = 0;
+        for (const row of rows) {
+            totalContentHeight += getElementTotalHeight(row);
+            totalWorkspaceHeight += getElemWorkspaceHeight(row);
+        }
+        if (totalWorkspaceHeight === 0) {
+            page.style.width = "";
+            return;
+        }
+        const extraHeight = paperContentHeight - totalContentHeight;
+        const workspaceAdjustmentFactor =
+            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;
+        const pageWorkspaces = page.querySelectorAll(".workspace");
+        pageWorkspaces.forEach((ws) => {
+            const originalHeight = ws.offsetHeight;
+            const newHeight = originalHeight * workspaceAdjustmentFactor;
+            ws.style.height = newHeight + "px";
+        });
+        page.style.width = "";
+    });
+
+    if (wasHighlighted) {
+        toggleWorkspaceHighlight(true);
+    }
+}
+
+export function toggleWorkspaceHighlight(isChecked) {
+    if (isChecked) {
+        document.body.classList.add("highlight-workspace");
+        if (!document.querySelector(".workspace-container")) {
+            document.querySelectorAll(".workspace").forEach((workspace) => {
+                const container = document.createElement("div");
+                container.classList.add("workspace-container");
+                container.style.height =
+                    window.getComputedStyle(workspace).height;
+                const original = document.createElement("div");
+                original.classList.add("original-workspace");
+                const originalHeight =
+                    workspace.getAttribute("data-space") || "0px";
+                original.setAttribute(
+                    "title",
+                    "Author-specified workspace height (" +
+                        originalHeight +
+                        ")"
+                );
+                original.style.height = originalHeight;
+                container.appendChild(original);
+                if (original.offsetHeight > workspace.offsetHeight) {
+                    original.classList.add("warning");
+                }
+                workspace.parentNode.insertBefore(container, workspace);
+                container.appendChild(workspace);
+            });
+        }
+    } else {
+        document.body.classList.remove("highlight-workspace");
+        document
+            .querySelectorAll(".workspace-container")
+            .forEach((container) => {
+                const workspace = container.querySelector(".workspace");
+                container.parentNode.insertBefore(workspace, container);
+                container.remove();
+            });
+    }
+}
+
+export function processWorkspace() {
+    if (typeof MathJax !== "undefined" && MathJax.typesetPromise) {
+        MathJax.typesetPromise();
+    }
+}
diff --git a/js/src/theme.js b/js/src/theme.js
new file mode 100644
index 000000000..fc593c1d1
--- /dev/null
+++ b/js/src/theme.js
@@ -0,0 +1,76 @@
+/**
+ * Dark/light mode switching.
+ *
+ * Detects user preference via localStorage or `prefers-color-scheme`,
+ * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.
+ */
+
+export function isDarkMode() {
+    if (document.documentElement.dataset.darkmode === "disabled") return false;
+
+    const currentTheme = localStorage.getItem("theme");
+    if (currentTheme === "dark") return true;
+    if (currentTheme === "light") return false;
+
+    return (
+        window.matchMedia &&
+        window.matchMedia("(prefers-color-scheme: dark)").matches
+    );
+}
+
+export function setDarkMode(isDark) {
+    if (document.documentElement.dataset.darkmode === "disabled") return;
+
+    const parentHtml = document.documentElement;
+    const iframes = document.querySelectorAll(
+        "iframe[data-dark-mode-enabled]"
+    );
+
+    if (isDark) {
+        parentHtml.classList.add("dark-mode");
+    } else {
+        parentHtml.classList.remove("dark-mode");
+    }
+
+    // Sync each iframe's <html> class with the parent
+    for (const iframe of iframes) {
+        try {
+            const iframeHtml = iframe.contentWindow.document.documentElement;
+            if (isDark) {
+                iframeHtml.classList.add("dark-mode");
+            } else {
+                iframeHtml.classList.remove("dark-mode");
+            }
+        } catch (err) {
+            console.warn("Dark mode sync to iframe failed:", err);
+        }
+    }
+
+    const modeButton = document.getElementById("light-dark-button");
+    if (modeButton) {
+        modeButton.querySelector(".icon").innerText = isDark
+            ? "light_mode"
+            : "dark_mode";
+        modeButton.querySelector(".name").innerText = isDark
+            ? "Light Mode"
+            : "Dark Mode";
+    }
+}
+
+export function initThemeToggle() {
+    // Run immediately to avoid flicker
+    setDarkMode(isDarkMode());
+
+    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)
+    const isDark = isDarkMode();
+    setDarkMode(isDark);
+
+    const modeButton = document.getElementById("light-dark-button");
+    if (modeButton) {
+        modeButton.addEventListener("click", function () {
+            const wasDark = isDarkMode();
+            setDarkMode(!wasDark);
+            localStorage.setItem("theme", wasDark ? "light" : "dark");
+        });
+    }
+}

From 942dff7e79e719824c80f1f45fb0bda45e3c0824 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:16:34 -0600
Subject: [PATCH 05/12] Convert standalone JS files to ES modules (Phase 3)

Create ES module versions of the existing standalone scripts in js/src/:

- toc.js: TOC sidebar, scroll-to-active, focused/expandable items
  (from pretext.js)
- knowl.js: xref/born-hidden knowl behavior with slide animation
  (from knowl.js)
- lti-iframe-resizer.js: SPLICE iframe resize message handler
  (from lti_iframe_resizer.js)
- search.js: lunr-based search UI with result ranking and snippets
  (from pretext_search.js)

Each module exports init functions that register event listeners.
Original files are left intact so existing <script> tags continue
to work until Phase 5 updates the XSL.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 js/src/knowl.js              | 336 +++++++++++++++++++++++++++++++++++
 js/src/lti-iframe-resizer.js |  66 +++++++
 js/src/search.js             | 319 +++++++++++++++++++++++++++++++++
 js/src/toc.js                | 248 ++++++++++++++++++++++++++
 4 files changed, 969 insertions(+)
 create mode 100644 js/src/knowl.js
 create mode 100644 js/src/lti-iframe-resizer.js
 create mode 100644 js/src/search.js
 create mode 100644 js/src/toc.js

diff --git a/js/src/knowl.js b/js/src/knowl.js
new file mode 100644
index 000000000..42e9d3fdf
--- /dev/null
+++ b/js/src/knowl.js
@@ -0,0 +1,336 @@
+/**
+ * Knowl behavior (from knowl.js).
+ *
+ * Manages xref knowls and born-hidden knowls: click-to-reveal with
+ * slide animation, lazy content fetching, and MathJax re-typesetting.
+ */
+
+// Used to animate both types of knowls
+class SlideRevealer {
+    static STATE = Object.freeze({
+        INACTIVE: 0,
+        CLOSING: 1,
+        EXPANDING: 2,
+    });
+
+    constructor(triggerElement, contentElement, animatedElement) {
+        this.triggerElement = triggerElement;
+        this.contentElement = contentElement;
+        this.animatedElement = animatedElement;
+
+        this.animation = null;
+        this.animationState = SlideRevealer.STATE.INACTIVE;
+
+        this.triggerElement.addEventListener("click", (e) => this.onClick(e));
+    }
+
+    onClick(e) {
+        if (e) e.preventDefault();
+        this.animatedElement.style.overflow = "hidden";
+
+        if (
+            this.animationState === SlideRevealer.STATE.CLOSING ||
+            !this.animatedElement.hasAttribute("open")
+        ) {
+            this.animatedElement.setAttribute("open", "");
+            this.triggerElement.setAttribute("open", "");
+            this.contentElement.style.display = "";
+            MathJax.typesetPromise().then(() =>
+                window.requestAnimationFrame(() => this.toggle(true))
+            );
+        } else if (
+            this.animationState === SlideRevealer.STATE.EXPANDING ||
+            this.animatedElement.hasAttribute("open")
+        ) {
+            this.toggle(false);
+        }
+    }
+
+    toggle(expanding) {
+        let closedHeight = 0;
+        if (this.animatedElement.contains(this.triggerElement))
+            closedHeight = this.triggerElement.offsetHeight;
+        const fullHeight = closedHeight + this.contentElement.offsetHeight;
+
+        const startHeight = `${expanding ? closedHeight : fullHeight}px`;
+        const endHeight = `${expanding ? fullHeight : closedHeight}px`;
+
+        const padding =
+            this.animatedElement.offsetHeight -
+            this.animatedElement.clientHeight;
+        const startPad = `${expanding ? 0 : padding}px`;
+        const endPad = `${expanding ? padding : 0}px`;
+
+        if (this.animation) this.animation.cancel();
+
+        const animDuration = Math.max(
+            Math.min(
+                (Math.abs(closedHeight - fullHeight) / 400) * 1000,
+                750
+            ),
+            250
+        );
+
+        this.animationState = expanding
+            ? SlideRevealer.STATE.EXPANDING
+            : SlideRevealer.STATE.CLOSING;
+        this.animation = this.animatedElement.animate(
+            {
+                height: [startHeight, endHeight],
+                paddingTop: [startPad, endPad],
+                paddingBottom: [startPad, endPad],
+            },
+            { duration: animDuration, easing: "ease" }
+        );
+
+        this.animation.onfinish = () => {
+            this.onAnimationFinish(expanding);
+        };
+        this.animation.oncancel = () => {
+            this.animationState = SlideRevealer.STATE.INACTIVE;
+        };
+    }
+
+    onAnimationFinish(isOpen) {
+        this.animation = null;
+        this.animationState = SlideRevealer.STATE.INACTIVE;
+
+        if (!isOpen) {
+            this.animatedElement.removeAttribute("open");
+            this.triggerElement.removeAttribute("open");
+        }
+
+        this.animatedElement.style.overflow = "";
+        if (!isOpen) this.contentElement.style.display = "none";
+
+        if (isOpen) {
+            let hasCallback =
+                this.contentElement.querySelectorAll(
+                    "[data-knowl-callback]"
+                );
+            hasCallback.forEach((el) => {
+                window[el.getAttribute("data-knowl-callback")](el, open);
+            });
+        }
+    }
+}
+
+class LinkKnowl {
+    static xrefCount = 0;
+
+    static initializeXrefKnowl(knowlLinkElement) {
+        if (
+            knowlLinkElement.getAttribute("data-knowl-uid") === null
+        ) {
+            return new LinkKnowl(knowlLinkElement);
+        }
+    }
+
+    constructor(knowlLinkElement) {
+        this.linkElement = knowlLinkElement;
+        this.outputElement = null;
+        this.uid = LinkKnowl.xrefCount++;
+        knowlLinkElement.setAttribute("data-knowl-uid", this.uid);
+        knowlLinkElement.setAttribute("role", "button");
+        knowlLinkElement.setAttribute(
+            "data-base-title",
+            knowlLinkElement.getAttribute("title") ||
+                this.linkElement.textContent
+        );
+        knowlLinkElement.classList.add("knowl__link");
+        this.updateLabels(false);
+        knowlLinkElement.addEventListener(
+            "click",
+            this.handleLinkClick.bind(this)
+        );
+    }
+
+    updateLabels(isVisible) {
+        const verb = isVisible
+            ? this.linkElement.getAttribute("data-close-label") || "Close"
+            : this.linkElement.getAttribute("data-reveal-label") ||
+              "Reveal";
+        const targetDescript =
+            this.linkElement.getAttribute("data-base-title");
+        const helpText = verb + " " + targetDescript;
+        this.linkElement.setAttribute("aria-label", helpText);
+        this.linkElement.setAttribute("title", helpText);
+    }
+
+    toggle() {
+        this.linkElement.classList.toggle("active");
+        const isActive = this.linkElement.classList.contains("active");
+        this.updateLabels(isActive);
+
+        if (isActive) {
+            const h = this.outputElement.getBoundingClientRect().height;
+            if (h > window.innerHeight) {
+                this.outputElement.scrollIntoView(true);
+            } else {
+                if (
+                    this.outputElement.getBoundingClientRect().bottom >
+                    window.innerHeight
+                )
+                    this.outputElement.scrollIntoView(false);
+            }
+        }
+    }
+
+    findOutputLocation() {
+        const invalidParents =
+            "table, mjx-container, div.tabular-box, .runestone > .parsons";
+        let el = this.linkElement.parentElement;
+        let problemAncestor = el.closest(invalidParents);
+        while (problemAncestor && problemAncestor !== el) {
+            el = problemAncestor;
+            problemAncestor = el.closest(invalidParents);
+        }
+        return el;
+    }
+
+    createOutputElement() {
+        const outputId = "knowl-uid-" + this.uid;
+        const outputContentsId = "knowl-output-" + this.uid;
+        const linkTarget =
+            this.linkElement.getAttribute("data-knowl");
+
+        const placeholderText =
+            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +
+            `Loading '${linkTarget}'` +
+            `</div>`;
+
+        const temp = document.createElement("template");
+        temp.innerHTML = placeholderText;
+        this.outputElement = temp.content.children[0];
+
+        const insertLoc = this.findOutputLocation(this.linkElement);
+        insertLoc.after(this.outputElement);
+    }
+
+    async getContent() {
+        const contentURL =
+            this.linkElement.getAttribute("data-knowl");
+        const knowlContent = await fetch(contentURL)
+            .then((response) => response.text())
+            .then((data) => {
+                let knowlDoc = new DOMParser().parseFromString(
+                    data,
+                    "text/html"
+                );
+                let tempContainer = knowlDoc.body;
+                let scripts = knowlDoc.querySelectorAll("head script");
+                tempContainer.append(...scripts);
+                return tempContainer;
+            })
+            .catch((error) => {
+                const destination =
+                    this.linkElement.getAttribute("href");
+                const text = this.linkElement.textContent;
+                const err_message =
+                    `<div class='knowl-output__error'>` +
+                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +
+                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +
+                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href="https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally">PreTeXt FAQ</a> for more information.</div>` +
+                    `</div>`;
+                return err_message;
+            });
+        return knowlContent;
+    }
+
+    handleLinkClick(event) {
+        event.preventDefault();
+
+        if (this.outputElement !== null) {
+            this.toggle();
+        } else {
+            this.createOutputElement();
+
+            const slideHandler = new SlideRevealer(
+                this.linkElement,
+                this.outputElement,
+                this.outputElement
+            );
+            this.linkElement.addEventListener("click", slideHandler);
+
+            let loadingTimeout = setTimeout(() => {
+                loadingTimeout = null;
+                slideHandler.onClick();
+                this.toggle();
+            }, 500);
+
+            const content = this.getContent();
+
+            content
+                .then((tempContainer) => {
+                    if (loadingTimeout !== null) {
+                        clearTimeout(loadingTimeout);
+                    }
+                    setTimeout(() => {
+                        slideHandler.onClick();
+                        this.toggle();
+                    }, 100);
+
+                    const runestoneElements =
+                        tempContainer.querySelectorAll(
+                            ".ptx-runestone-container"
+                        );
+                    [...runestoneElements].forEach((e) => {
+                        const rsId =
+                            e.querySelector("[data-component]")?.id;
+                        const onPage = document.getElementById(rsId);
+                        if (onPage) {
+                            e.innerHTML = `<div class="para">The interactive that belongs here is already on the page and cannot appear multiple times. <a href="#${rsId}">Scroll to interactive.</a>`;
+                        } else {
+                            window.runestoneComponents.renderOneComponent(
+                                e
+                            );
+                        }
+                    });
+
+                    const children = [...tempContainer.children];
+                    this.outputElement.innerHTML = "";
+                    this.outputElement.append(...children);
+
+                    addKnowls(this.outputElement);
+                    Prism.highlightAllUnder(this.outputElement);
+
+                    [
+                        ...this.outputElement.getElementsByTagName(
+                            "script"
+                        ),
+                    ].forEach((s) => {
+                        if (
+                            s.getAttribute("type") === null ||
+                            s.getAttribute("type") ===
+                                "text/javascript"
+                        ) {
+                            eval(s.innerHTML);
+                        }
+                    });
+                })
+                .catch((data) => {
+                    console.log(
+                        "Error fetching knowl content: " + data
+                    );
+                });
+        }
+    }
+}
+
+export function addKnowls(target) {
+    const xrefs = target.querySelectorAll("[data-knowl]");
+    for (const xref of xrefs) {
+        LinkKnowl.initializeXrefKnowl(xref);
+    }
+
+    const bornHiddens = target.querySelectorAll(".born-hidden-knowl");
+    for (const bhk of bornHiddens) {
+        const summary = bhk.querySelector(":scope > summary");
+        const contents = bhk.querySelector(":scope > summary + *");
+        new SlideRevealer(summary, contents, bhk);
+    }
+}
+
+export function initKnowls() {
+    addKnowls(document);
+}
diff --git a/js/src/lti-iframe-resizer.js b/js/src/lti-iframe-resizer.js
new file mode 100644
index 000000000..6223b39d7
--- /dev/null
+++ b/js/src/lti-iframe-resizer.js
@@ -0,0 +1,66 @@
+/**
+ * LTI iframe resizer (from lti_iframe_resizer.js).
+ *
+ * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),
+ * adjusting iframe dimensions based on postMessage events.
+ *
+ * @see https://cssplice.org/
+ */
+
+export function sendResizeRequest(el) {
+    el.contentWindow.postMessage("requestResize", "*");
+}
+
+export function initLtiIframeResizer() {
+    window.addEventListener("message", function (event) {
+        let edata = event.data;
+
+        // MoM sends event.data as a string instead of JSON
+        if (
+            typeof event.data == "string" &&
+            event.data.match(/lti\.frameResize/)
+        ) {
+            edata = JSON.parse(event.data);
+        }
+
+        if (edata.subject === "lti.frameResize") {
+            if ("frame_id" in edata) {
+                const el = document.getElementById(edata["frame_id"]);
+                if (el) {
+                    el.style.height = edata.height + "px";
+                }
+                if (
+                    edata.wrapheight &&
+                    document.getElementById(edata["frame_id"] + "wrap")
+                ) {
+                    document.getElementById(
+                        edata["frame_id"] + "wrap"
+                    ).style.height = edata.wrapheight + "px";
+                }
+            } else if ("iframe_resize_id" in edata) {
+                const el = document.getElementById(
+                    edata["iframe_resize_id"]
+                );
+                if (el) {
+                    el.style.height = edata.height + "px";
+                }
+            } else {
+                const iFrames =
+                    document.getElementsByTagName("iframe");
+                for (const iFrame of iFrames) {
+                    if (iFrame.contentWindow === event.source) {
+                        if (edata.height) {
+                            iFrame.height = edata.height;
+                            iFrame.style.height = edata.height + "px";
+                        }
+                        if (edata.width) {
+                            iFrame.width = edata.width;
+                            iFrame.style.width = edata.width + "px";
+                        }
+                        break;
+                    }
+                }
+            }
+        }
+    });
+}
diff --git a/js/src/search.js b/js/src/search.js
new file mode 100644
index 000000000..83ed0ed94
--- /dev/null
+++ b/js/src/search.js
@@ -0,0 +1,319 @@
+/**
+ * Search functionality (from pretext_search.js).
+ *
+ * Provides the search UI: querying the lunr index, ranking results,
+ * rendering result lists with highlighted snippets.
+ *
+ * Expects these globals from the generated lunr-pretext-search-index.js:
+ *   - ptx_lunr_idx
+ *   - ptx_lunr_docs
+ *   - ptx_lunr_search_style
+ * Also expects: lunr (the lunr.js library), MathJax
+ */
+
+function findEntry(resultId, db) {
+    for (const page of db) {
+        if (page.id === resultId) return page;
+    }
+    return resultId;
+}
+
+function augmentResults(result, docs) {
+    for (let res of result) {
+        let info = findEntry(res.ref, docs);
+        res.number = info.number;
+        res.type = info.type;
+        res.title = info.title;
+        res.url = info.url;
+        res.level = info.level;
+        res.snum = info.snum;
+        res.score = parseFloat(res.score);
+
+        const LEVEL_WEIGHTS = [3, 2, 1.5];
+        if (res.level < 2) res.score *= LEVEL_WEIGHTS[res.level];
+
+        res.body = "";
+        const REVEAL_WINDOW = 30;
+        let titleMarked = false;
+        for (const hit in res.matchData.metadata) {
+            if (res.matchData.metadata[hit].title) {
+                if (!titleMarked) {
+                    if (!res.matchData.metadata[hit].title.position)
+                        continue;
+                    let positionData =
+                        res.matchData.metadata[hit].title.position[0];
+                    const startClipInd = positionData[0];
+                    const endClipInd = positionData[0] + positionData[1];
+                    res.title =
+                        res.title.substring(0, endClipInd) +
+                        "</span>" +
+                        res.title.substring(endClipInd);
+                    res.title =
+                        res.title.substring(0, startClipInd) +
+                        '<span class="search-result-clip-highlight">' +
+                        res.title.substring(startClipInd);
+                    titleMarked = true;
+                }
+            } else if (res.matchData.metadata[hit].body) {
+                if (!res.matchData.metadata[hit].body.position)
+                    continue;
+                const bodyContent = info.body;
+                let positionData =
+                    res.matchData.metadata[hit].body.position[0];
+                const startInd = positionData[0] - REVEAL_WINDOW;
+                const endInd =
+                    positionData[0] + positionData[1] + REVEAL_WINDOW;
+                const startClipInd = positionData[0];
+                const endClipInd = positionData[0] + positionData[1];
+                let resultSnippet =
+                    (startInd > 0 ? "..." : "") +
+                    bodyContent.substring(startInd, startClipInd);
+                resultSnippet +=
+                    '<span class="search-result-clip-highlight">' +
+                    bodyContent.substring(startClipInd, endClipInd) +
+                    "</span>";
+                resultSnippet +=
+                    bodyContent.substring(endClipInd, endInd) +
+                    (endInd < bodyContent.length ? "..." : "") +
+                    "<br/>";
+                res.body += resultSnippet;
+            }
+        }
+    }
+}
+
+function rearrangedArray(arry) {
+    let newarry = [];
+    let ct = 1;
+    while (arry.length > 0 && ct < 500) {
+        ++ct;
+        const locofmax = maxLocation(arry);
+        let segmentstart = locofmax;
+        let segmentlength = 1;
+        while (arry[segmentstart].level == "2") {
+            --segmentstart;
+        }
+        while (
+            segmentstart + segmentlength < arry.length &&
+            arry[segmentstart + segmentlength].level == "2"
+        ) {
+            ++segmentlength;
+        }
+        newarry.push(...arry.splice(segmentstart, segmentlength));
+    }
+    return newarry;
+}
+
+function maxLocation(arry) {
+    let maxloc = 0;
+    let maxvalsofar = -1;
+    for (let index = 0; index < arry.length; ++index) {
+        if (arry[index].score > maxvalsofar) {
+            maxloc = index;
+            maxvalsofar = arry[index].score;
+        }
+    }
+    return maxloc;
+}
+
+function comparePosition(a, b) {
+    if (a.snum < b.snum) return -1;
+    if (a.snum > b.snum) return 1;
+    return 0;
+}
+
+function addResultToPage(searchterms, result, docs, numUnshown, resultArea) {
+    if (document.getElementById("searchempty")) {
+        document.getElementById("searchempty").style.display = "none";
+    }
+    let len = result.length;
+    if (len == 0) {
+        if (document.getElementById("searchempty")) {
+            document.getElementById("searchempty").style.display = "block";
+        } else {
+            let noresults = document.createElement("div");
+            noresults.classList.add("noresults");
+            noresults.innerHTML = "No results were found.";
+            resultArea.appendChild(noresults);
+        }
+        document.getElementById("searchresultsplaceholder").style.display =
+            null;
+        return;
+    }
+
+    let allScores = result.map(function (r) {
+        return r.score;
+    });
+    allScores.sort((a, b) => a - b);
+    allScores.reverse();
+
+    let high = allScores[Math.floor(len * 0.2)];
+    let med = allScores[Math.floor(len * 0.4)];
+    let low = allScores[Math.floor(len * 0.75)];
+
+    if (
+        typeof ptx_lunr_search_style !== "undefined" &&
+        ptx_lunr_search_style == "reference"
+    ) {
+        result = rearrangedArray(result);
+    }
+    let indent = "1";
+    let currIndent = indent;
+    let origResult = resultArea;
+
+    for (const res of result) {
+        let link = document.createElement("a");
+        if (res.score >= high) {
+            link.classList.add("high_result");
+        } else if (res.score >= med) {
+            link.classList.add("medium_result");
+        } else if (res.score >= low) {
+            link.classList.add("low_result");
+        } else {
+            link.classList.add("no_result");
+        }
+        currIndent = res.level;
+        if (currIndent > indent) {
+            indent = currIndent;
+            let ilist = document.createElement("ul");
+            ilist.classList.add("detailed_result");
+            resultArea.appendChild(ilist);
+            resultArea = ilist;
+        } else if (currIndent < indent) {
+            resultArea = origResult;
+            indent = currIndent;
+        }
+        link.href = `${res.url}`;
+        link.innerHTML = `${res.type} ${res.number} ${res.title}`;
+        let clip = document.createElement("div");
+        clip.classList.add("search-result-clip");
+        clip.innerHTML = `${res.body}`;
+        let bullet = document.createElement("li");
+        bullet.classList.add("search-result-bullet");
+        bullet.appendChild(link);
+        bullet.appendChild(clip);
+        let p = document.createElement("text");
+        p.classList.add("search-result-score");
+        p.innerHTML = `  (${res.score.toFixed(2)})`;
+        bullet.appendChild(p);
+        resultArea.appendChild(bullet);
+    }
+
+    const resultsDiv = document.getElementById("searchresultsplaceholder");
+    const backDiv = document.querySelector(".searchresultsbackground");
+    resultArea.querySelectorAll("a").forEach((link) => {
+        link.addEventListener("click", (e) => {
+            backDiv.style.display = "none";
+            resultsDiv.style.display = "none";
+        });
+    });
+    document.getElementById("searchresultsplaceholder").style.display = null;
+    MathJax.typesetPromise();
+}
+
+function doSearch(searchlocation = "A") {
+    let terms;
+    if (searchlocation == "A") {
+        terms = document.getElementById("ptxsearch").value;
+    } else {
+        terms = document.getElementById("ptxsearchB").value;
+    }
+
+    localStorage.setItem(
+        "last-search-terms",
+        JSON.stringify({ terms: terms, time: Date.now() })
+    );
+
+    let resultArea = document.getElementById("searchresults");
+    resultArea.innerHTML = "";
+
+    let searchterms = terms;
+    if (searchlocation == "B") {
+        document.getElementById("ptxsearch").value = searchterms;
+    }
+
+    searchterms = searchterms.toLowerCase().trim();
+    let pageResult = [];
+    if (searchterms != "") {
+        pageResult = ptx_lunr_idx.query((q) => {
+            for (let term of searchterms.split(" ")) {
+                q.term(term, { fields: ["title"], boost: 20 });
+                q.term(term, {
+                    wildcard: lunr.Query.wildcard.TRAILING,
+                    fields: ["title"],
+                    boost: 10,
+                });
+                q.term(term, { fields: ["body"], boost: 5 });
+                q.term(term, {
+                    wildcard: lunr.Query.wildcard.TRAILING,
+                    fields: ["body"],
+                });
+            }
+        });
+    }
+
+    let snum = 0;
+    for (let doc of ptx_lunr_docs) {
+        doc.snum = snum;
+        snum += 1;
+    }
+
+    const MAX_RESULTS = 100;
+    let numUnshown =
+        pageResult.length > MAX_RESULTS
+            ? pageResult.length - MAX_RESULTS
+            : 0;
+    pageResult = pageResult.slice(0, MAX_RESULTS);
+
+    augmentResults(pageResult, ptx_lunr_docs);
+    pageResult.sort(comparePosition);
+    addResultToPage(
+        terms,
+        pageResult,
+        ptx_lunr_docs,
+        numUnshown,
+        resultArea
+    );
+    MathJax.typeset();
+}
+
+export function initSearch() {
+    const resultsDiv = document.getElementById("searchresultsplaceholder");
+    if (!resultsDiv) return;
+
+    const backDiv = document.createElement("div");
+    backDiv.classList.add("searchresultsbackground");
+    backDiv.style.display = "none";
+    resultsDiv.parentNode.appendChild(backDiv);
+
+    const searchButton = document.getElementById("searchbutton");
+    if (searchButton) {
+        searchButton.addEventListener("click", (e) => {
+            resultsDiv.style.display = null;
+            backDiv.style.display = null;
+            let searchInput = document.getElementById("ptxsearch");
+            const lastSearch = localStorage.getItem("last-search-terms");
+            if (lastSearch) {
+                searchInput.value = JSON.parse(lastSearch).terms;
+            }
+            searchInput.select();
+            doSearch();
+        });
+    }
+
+    const searchInput = document.getElementById("ptxsearch");
+    if (searchInput) {
+        searchInput.addEventListener("input", (e) => {
+            doSearch();
+        });
+    }
+
+    const closeButton = document.getElementById("closesearchresults");
+    if (closeButton) {
+        closeButton.addEventListener("click", (e) => {
+            resultsDiv.style.display = "none";
+            backDiv.style.display = "none";
+            document.getElementById("searchbutton").focus();
+        });
+    }
+}
diff --git a/js/src/toc.js b/js/src/toc.js
new file mode 100644
index 000000000..300704d6c
--- /dev/null
+++ b/js/src/toc.js
@@ -0,0 +1,248 @@
+/**
+ * TOC, sidebar, and navigation (from pretext.js).
+ *
+ * Manages the table-of-contents sidebar: scroll-to-active, toggle
+ * visibility, auto-collapse, focused/expandable TOC items, and
+ * hash-based navigation.
+ */
+
+function getOffsetTop(e) {
+    if (!e) return 0;
+    return getOffsetTop(e.offsetParent) + e.offsetTop;
+}
+
+function scrollTocToActive() {
+    let fileNameWHash = window.location.href.split("/").pop();
+    let fileName = fileNameWHash.split("#")[0];
+
+    let tocEntry = document.querySelector(
+        '#ptx-toc a[href="' + fileName + '"]'
+    );
+    if (!tocEntry) return;
+
+    let tocEntryTop = 0;
+    if (fileNameWHash.includes("#")) {
+        let tocEntryWHash = document.querySelector(
+            '#ptx-toc a[href="' + fileNameWHash + '"]'
+        );
+        if (tocEntryWHash) {
+            tocEntry
+                .closest("li")
+                .querySelectorAll("li")
+                .forEach((li) => {
+                    li.classList.remove("active");
+                });
+            tocEntryWHash.closest("li").classList.add("active");
+            tocEntryTop = getOffsetTop(tocEntryWHash);
+        }
+    }
+    if (!tocEntryTop) {
+        tocEntryTop = getOffsetTop(tocEntry);
+    }
+
+    tocEntry.closest("li").classList.add("active");
+    let toc = document.querySelector("#ptx-toc");
+    let tocTop = getOffsetTop(toc);
+    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;
+}
+
+function toggletoc() {
+    const thesidebar = document.getElementById("ptx-sidebar");
+    if (
+        thesidebar.classList.contains("hidden") ||
+        thesidebar.classList.contains("visible")
+    ) {
+        thesidebar.classList.toggle("hidden");
+        thesidebar.classList.toggle("visible");
+    } else if (thesidebar.offsetParent === null) {
+        thesidebar.classList.toggle("visible");
+    } else {
+        thesidebar.classList.toggle("hidden");
+    }
+    scrollTocToActive();
+}
+
+function samePageLink(a) {
+    if (!(a instanceof HTMLAnchorElement)) return false;
+    try {
+        const linkUrl = new URL(a.href, document.baseURI);
+        const currentUrl = new URL(window.location.href);
+        const sameDocument =
+            linkUrl.origin === currentUrl.origin &&
+            linkUrl.pathname === currentUrl.pathname &&
+            linkUrl.search === currentUrl.search;
+        return sameDocument && !!linkUrl.hash;
+    } catch (e) {
+        return false;
+    }
+}
+
+function getTOCItemType(item) {
+    for (let className of item.classList) {
+        if (
+            className !== "toc-item" &&
+            className.length > 3 &&
+            className.slice(0, 4) === "toc-"
+        )
+            return className.slice(4);
+    }
+    return "";
+}
+
+function getTOCItemDepth(item) {
+    let depth = 0;
+    let curParent = item.closest(".toc-item-list");
+    while (curParent !== null) {
+        depth++;
+        curParent = curParent.parentElement.closest(".toc-item-list");
+    }
+    return depth;
+}
+
+function toggleTOCItem(expander) {
+    let listItem = expander.closest(".toc-item");
+    listItem.classList.toggle("expanded");
+    let expanded = listItem.classList.contains("expanded");
+    let itemType = getTOCItemType(listItem);
+
+    if (expanded) {
+        expander.title = "Close" + (itemType !== "" ? " " + itemType : "");
+    } else {
+        expander.title = "Expand" + (itemType !== "" ? " " + itemType : "");
+    }
+
+    for (const childUL of listItem.querySelectorAll(
+        ":scope > ul.toc-item-list"
+    )) {
+        for (const childItem of childUL.querySelectorAll(
+            ":scope > li.toc-item"
+        )) {
+            if (expanded) {
+                childItem.classList.add("visible");
+                childItem.classList.remove("hidden");
+            } else {
+                childItem.classList.remove("visible");
+                childItem.classList.add("hidden");
+            }
+        }
+    }
+}
+
+export function initToc() {
+    const thetocbutton = document.getElementsByClassName("toc-toggle")[0];
+    if (thetocbutton) {
+        thetocbutton.addEventListener("click", (e) => {
+            toggletoc();
+            e.stopPropagation();
+        });
+    }
+
+    // Auto-collapse TOC when clicking outside
+    if (
+        getComputedStyle(document.documentElement).getPropertyValue(
+            "--auto-collapse-toc"
+        ) == "yes"
+    ) {
+        const sidebar = document.getElementById("ptx-sidebar");
+
+        window.addEventListener("click", function (event) {
+            if (sidebar.classList.contains("visible")) {
+                if (!event.composedPath().includes(sidebar)) {
+                    toggletoc();
+                }
+            }
+        });
+
+        sidebar.addEventListener("click", function (event) {
+            if (samePageLink(event.target.closest("a"))) {
+                toggletoc();
+            }
+        });
+
+        window.addEventListener("pageshow", (e) => {
+            if (e.persisted) {
+                sidebar.classList.remove("visible");
+                sidebar.classList.add("hidden");
+            }
+        });
+    }
+}
+
+export function initFocusedToc() {
+    if (document.querySelector(".ptx-toc.focused") === null) return;
+
+    let maxDepth = 1000;
+    for (let className of document.querySelector(".ptx-toc").classList)
+        if (className.length > 5 && className.slice(0, 5) === "depth")
+            maxDepth = Number(className.slice(5));
+
+    let preexpandedLevels = 1;
+    let tocDataSet = document.querySelector(".ptx-toc").dataset;
+    if (typeof tocDataSet.preexpandedLevels !== "undefined")
+        preexpandedLevels = Number(tocDataSet.preexpandedLevels);
+
+    let tocItems = document.querySelectorAll(
+        ".ptx-toc ul.structural > .toc-item"
+    );
+    for (const tocItem of tocItems) {
+        let hasChildren =
+            tocItem.querySelector("ul.structural") !== null;
+        let depth = getTOCItemDepth(tocItem);
+
+        if (hasChildren && depth < maxDepth) {
+            let expander = document.createElement("button");
+            expander.classList.add("toc-expander");
+            expander.classList.add("toc-chevron-surround");
+            expander.title = "toc-expander";
+            expander.innerHTML =
+                '<span class="icon material-symbols-outlined" aria-hidden="true"></span>';
+            tocItem.querySelector(".toc-title-box").append(expander);
+            expander.addEventListener("click", () => {
+                toggleTOCItem(expander);
+            });
+
+            let isActive =
+                tocItem.classList.contains("contains-active") ||
+                tocItem.classList.contains("active");
+            let preExpanded = isActive || depth < preexpandedLevels;
+            let itemType = getTOCItemType(tocItem);
+            if (preExpanded) {
+                toggleTOCItem(expander);
+            } else {
+                expander.title =
+                    "Expand" + (itemType !== "" ? " " + itemType : "");
+            }
+        }
+    }
+
+    // Expand parents of hash-linked TOC item
+    if (window.location.hash) {
+        let hash = window.location.hash;
+        let hashLink = document.querySelector(
+            `.ptx-toc a[href$="${hash}"]`
+        );
+        if (hashLink) {
+            let parentTocItem = hashLink.closest(".toc-item");
+            while (
+                parentTocItem &&
+                !parentTocItem.classList.contains("contains-active")
+            ) {
+                parentTocItem.classList.add("contains-active");
+                let expander =
+                    parentTocItem.querySelector(".toc-expander");
+                if (expander) {
+                    if (!parentTocItem.classList.contains("expanded")) {
+                        toggleTOCItem(expander);
+                    }
+                }
+                parentTocItem =
+                    parentTocItem.parentElement.closest(".toc-item");
+            }
+        }
+    }
+}
+
+export function initScrollToc() {
+    scrollTocToActive();
+    window.onhashchange = scrollTocToActive;
+}

From 59069ac4de2ae7fb0b046b074a4a9681a06d4bfe Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:17:49 -0600
Subject: [PATCH 06/12] Create bundle entry points, build dist, delete jQuery
 (Phase 4)

Entry points:
- js/src/pretext-core-entry.js: imports all core modules (TOC, knowls,
  LTI resizer, permalink, image magnify, GeoGebra, keyboard nav,
  print preview, theme, embed, code-copy, deprecated modules)
- js/src/pretext-search-entry.js: imports search module

Built bundles (committed for users without Node):
- js/dist/pretext-core.js (59 KB) + sourcemap
- js/dist/pretext-search.js (9 KB) + sourcemap

Both bundles are IIFE format, unminified, with sourcemaps.
MathJax is marked as external (loaded separately).

Deleted js/jquery.min.js  no longer needed since all jQuery calls
have been replaced with vanilla DOM in Phase 2.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 js/dist/pretext-core.js        | 1612 ++++++++++++++++++++++++++++++++
 js/dist/pretext-core.js.map    |    7 +
 js/dist/pretext-search.js      |  263 ++++++
 js/dist/pretext-search.js.map  |    7 +
 js/jquery.min.js               |    2 -
 js/src/pretext-core-entry.js   |   83 ++
 js/src/pretext-search-entry.js |   19 +
 7 files changed, 1991 insertions(+), 2 deletions(-)
 create mode 100644 js/dist/pretext-core.js
 create mode 100644 js/dist/pretext-core.js.map
 create mode 100644 js/dist/pretext-search.js
 create mode 100644 js/dist/pretext-search.js.map
 delete mode 100644 js/jquery.min.js
 create mode 100644 js/src/pretext-core-entry.js
 create mode 100644 js/src/pretext-search-entry.js

diff --git a/js/dist/pretext-core.js b/js/dist/pretext-core.js
new file mode 100644
index 000000000..51d95dcee
--- /dev/null
+++ b/js/dist/pretext-core.js
@@ -0,0 +1,1612 @@
+(() => {
+  // ../../js/src/toc.js
+  function getOffsetTop(e) {
+    if (!e) return 0;
+    return getOffsetTop(e.offsetParent) + e.offsetTop;
+  }
+  function scrollTocToActive() {
+    let fileNameWHash = window.location.href.split("/").pop();
+    let fileName = fileNameWHash.split("#")[0];
+    let tocEntry = document.querySelector(
+      '#ptx-toc a[href="' + fileName + '"]'
+    );
+    if (!tocEntry) return;
+    let tocEntryTop = 0;
+    if (fileNameWHash.includes("#")) {
+      let tocEntryWHash = document.querySelector(
+        '#ptx-toc a[href="' + fileNameWHash + '"]'
+      );
+      if (tocEntryWHash) {
+        tocEntry.closest("li").querySelectorAll("li").forEach((li) => {
+          li.classList.remove("active");
+        });
+        tocEntryWHash.closest("li").classList.add("active");
+        tocEntryTop = getOffsetTop(tocEntryWHash);
+      }
+    }
+    if (!tocEntryTop) {
+      tocEntryTop = getOffsetTop(tocEntry);
+    }
+    tocEntry.closest("li").classList.add("active");
+    let toc = document.querySelector("#ptx-toc");
+    let tocTop = getOffsetTop(toc);
+    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;
+  }
+  function toggletoc() {
+    const thesidebar = document.getElementById("ptx-sidebar");
+    if (thesidebar.classList.contains("hidden") || thesidebar.classList.contains("visible")) {
+      thesidebar.classList.toggle("hidden");
+      thesidebar.classList.toggle("visible");
+    } else if (thesidebar.offsetParent === null) {
+      thesidebar.classList.toggle("visible");
+    } else {
+      thesidebar.classList.toggle("hidden");
+    }
+    scrollTocToActive();
+  }
+  function samePageLink(a) {
+    if (!(a instanceof HTMLAnchorElement)) return false;
+    try {
+      const linkUrl = new URL(a.href, document.baseURI);
+      const currentUrl = new URL(window.location.href);
+      const sameDocument = linkUrl.origin === currentUrl.origin && linkUrl.pathname === currentUrl.pathname && linkUrl.search === currentUrl.search;
+      return sameDocument && !!linkUrl.hash;
+    } catch (e) {
+      return false;
+    }
+  }
+  function getTOCItemType(item) {
+    for (let className of item.classList) {
+      if (className !== "toc-item" && className.length > 3 && className.slice(0, 4) === "toc-")
+        return className.slice(4);
+    }
+    return "";
+  }
+  function getTOCItemDepth(item) {
+    let depth = 0;
+    let curParent = item.closest(".toc-item-list");
+    while (curParent !== null) {
+      depth++;
+      curParent = curParent.parentElement.closest(".toc-item-list");
+    }
+    return depth;
+  }
+  function toggleTOCItem(expander) {
+    let listItem = expander.closest(".toc-item");
+    listItem.classList.toggle("expanded");
+    let expanded = listItem.classList.contains("expanded");
+    let itemType = getTOCItemType(listItem);
+    if (expanded) {
+      expander.title = "Close" + (itemType !== "" ? " " + itemType : "");
+    } else {
+      expander.title = "Expand" + (itemType !== "" ? " " + itemType : "");
+    }
+    for (const childUL of listItem.querySelectorAll(
+      ":scope > ul.toc-item-list"
+    )) {
+      for (const childItem of childUL.querySelectorAll(
+        ":scope > li.toc-item"
+      )) {
+        if (expanded) {
+          childItem.classList.add("visible");
+          childItem.classList.remove("hidden");
+        } else {
+          childItem.classList.remove("visible");
+          childItem.classList.add("hidden");
+        }
+      }
+    }
+  }
+  function initToc() {
+    const thetocbutton = document.getElementsByClassName("toc-toggle")[0];
+    if (thetocbutton) {
+      thetocbutton.addEventListener("click", (e) => {
+        toggletoc();
+        e.stopPropagation();
+      });
+    }
+    if (getComputedStyle(document.documentElement).getPropertyValue(
+      "--auto-collapse-toc"
+    ) == "yes") {
+      const sidebar = document.getElementById("ptx-sidebar");
+      window.addEventListener("click", function(event2) {
+        if (sidebar.classList.contains("visible")) {
+          if (!event2.composedPath().includes(sidebar)) {
+            toggletoc();
+          }
+        }
+      });
+      sidebar.addEventListener("click", function(event2) {
+        if (samePageLink(event2.target.closest("a"))) {
+          toggletoc();
+        }
+      });
+      window.addEventListener("pageshow", (e) => {
+        if (e.persisted) {
+          sidebar.classList.remove("visible");
+          sidebar.classList.add("hidden");
+        }
+      });
+    }
+  }
+  function initFocusedToc() {
+    if (document.querySelector(".ptx-toc.focused") === null) return;
+    let maxDepth = 1e3;
+    for (let className of document.querySelector(".ptx-toc").classList)
+      if (className.length > 5 && className.slice(0, 5) === "depth")
+        maxDepth = Number(className.slice(5));
+    let preexpandedLevels = 1;
+    let tocDataSet = document.querySelector(".ptx-toc").dataset;
+    if (typeof tocDataSet.preexpandedLevels !== "undefined")
+      preexpandedLevels = Number(tocDataSet.preexpandedLevels);
+    let tocItems = document.querySelectorAll(
+      ".ptx-toc ul.structural > .toc-item"
+    );
+    for (const tocItem of tocItems) {
+      let hasChildren = tocItem.querySelector("ul.structural") !== null;
+      let depth = getTOCItemDepth(tocItem);
+      if (hasChildren && depth < maxDepth) {
+        let expander = document.createElement("button");
+        expander.classList.add("toc-expander");
+        expander.classList.add("toc-chevron-surround");
+        expander.title = "toc-expander";
+        expander.innerHTML = '<span class="icon material-symbols-outlined" aria-hidden="true"></span>';
+        tocItem.querySelector(".toc-title-box").append(expander);
+        expander.addEventListener("click", () => {
+          toggleTOCItem(expander);
+        });
+        let isActive = tocItem.classList.contains("contains-active") || tocItem.classList.contains("active");
+        let preExpanded = isActive || depth < preexpandedLevels;
+        let itemType = getTOCItemType(tocItem);
+        if (preExpanded) {
+          toggleTOCItem(expander);
+        } else {
+          expander.title = "Expand" + (itemType !== "" ? " " + itemType : "");
+        }
+      }
+    }
+    if (window.location.hash) {
+      let hash = window.location.hash;
+      let hashLink = document.querySelector(
+        `.ptx-toc a[href$="${hash}"]`
+      );
+      if (hashLink) {
+        let parentTocItem = hashLink.closest(".toc-item");
+        while (parentTocItem && !parentTocItem.classList.contains("contains-active")) {
+          parentTocItem.classList.add("contains-active");
+          let expander = parentTocItem.querySelector(".toc-expander");
+          if (expander) {
+            if (!parentTocItem.classList.contains("expanded")) {
+              toggleTOCItem(expander);
+            }
+          }
+          parentTocItem = parentTocItem.parentElement.closest(".toc-item");
+        }
+      }
+    }
+  }
+  function initScrollToc() {
+    scrollTocToActive();
+    window.onhashchange = scrollTocToActive;
+  }
+
+  // ../../js/src/knowl.js
+  var SlideRevealer = class _SlideRevealer {
+    static STATE = Object.freeze({
+      INACTIVE: 0,
+      CLOSING: 1,
+      EXPANDING: 2
+    });
+    constructor(triggerElement, contentElement, animatedElement) {
+      this.triggerElement = triggerElement;
+      this.contentElement = contentElement;
+      this.animatedElement = animatedElement;
+      this.animation = null;
+      this.animationState = _SlideRevealer.STATE.INACTIVE;
+      this.triggerElement.addEventListener("click", (e) => this.onClick(e));
+    }
+    onClick(e) {
+      if (e) e.preventDefault();
+      this.animatedElement.style.overflow = "hidden";
+      if (this.animationState === _SlideRevealer.STATE.CLOSING || !this.animatedElement.hasAttribute("open")) {
+        this.animatedElement.setAttribute("open", "");
+        this.triggerElement.setAttribute("open", "");
+        this.contentElement.style.display = "";
+        MathJax.typesetPromise().then(
+          () => window.requestAnimationFrame(() => this.toggle(true))
+        );
+      } else if (this.animationState === _SlideRevealer.STATE.EXPANDING || this.animatedElement.hasAttribute("open")) {
+        this.toggle(false);
+      }
+    }
+    toggle(expanding) {
+      let closedHeight = 0;
+      if (this.animatedElement.contains(this.triggerElement))
+        closedHeight = this.triggerElement.offsetHeight;
+      const fullHeight = closedHeight + this.contentElement.offsetHeight;
+      const startHeight = `${expanding ? closedHeight : fullHeight}px`;
+      const endHeight = `${expanding ? fullHeight : closedHeight}px`;
+      const padding = this.animatedElement.offsetHeight - this.animatedElement.clientHeight;
+      const startPad = `${expanding ? 0 : padding}px`;
+      const endPad = `${expanding ? padding : 0}px`;
+      if (this.animation) this.animation.cancel();
+      const animDuration = Math.max(
+        Math.min(
+          Math.abs(closedHeight - fullHeight) / 400 * 1e3,
+          750
+        ),
+        250
+      );
+      this.animationState = expanding ? _SlideRevealer.STATE.EXPANDING : _SlideRevealer.STATE.CLOSING;
+      this.animation = this.animatedElement.animate(
+        {
+          height: [startHeight, endHeight],
+          paddingTop: [startPad, endPad],
+          paddingBottom: [startPad, endPad]
+        },
+        { duration: animDuration, easing: "ease" }
+      );
+      this.animation.onfinish = () => {
+        this.onAnimationFinish(expanding);
+      };
+      this.animation.oncancel = () => {
+        this.animationState = _SlideRevealer.STATE.INACTIVE;
+      };
+    }
+    onAnimationFinish(isOpen) {
+      this.animation = null;
+      this.animationState = _SlideRevealer.STATE.INACTIVE;
+      if (!isOpen) {
+        this.animatedElement.removeAttribute("open");
+        this.triggerElement.removeAttribute("open");
+      }
+      this.animatedElement.style.overflow = "";
+      if (!isOpen) this.contentElement.style.display = "none";
+      if (isOpen) {
+        let hasCallback = this.contentElement.querySelectorAll(
+          "[data-knowl-callback]"
+        );
+        hasCallback.forEach((el) => {
+          window[el.getAttribute("data-knowl-callback")](el, open);
+        });
+      }
+    }
+  };
+  var LinkKnowl = class _LinkKnowl {
+    static xrefCount = 0;
+    static initializeXrefKnowl(knowlLinkElement) {
+      if (knowlLinkElement.getAttribute("data-knowl-uid") === null) {
+        return new _LinkKnowl(knowlLinkElement);
+      }
+    }
+    constructor(knowlLinkElement) {
+      this.linkElement = knowlLinkElement;
+      this.outputElement = null;
+      this.uid = _LinkKnowl.xrefCount++;
+      knowlLinkElement.setAttribute("data-knowl-uid", this.uid);
+      knowlLinkElement.setAttribute("role", "button");
+      knowlLinkElement.setAttribute(
+        "data-base-title",
+        knowlLinkElement.getAttribute("title") || this.linkElement.textContent
+      );
+      knowlLinkElement.classList.add("knowl__link");
+      this.updateLabels(false);
+      knowlLinkElement.addEventListener(
+        "click",
+        this.handleLinkClick.bind(this)
+      );
+    }
+    updateLabels(isVisible) {
+      const verb = isVisible ? this.linkElement.getAttribute("data-close-label") || "Close" : this.linkElement.getAttribute("data-reveal-label") || "Reveal";
+      const targetDescript = this.linkElement.getAttribute("data-base-title");
+      const helpText = verb + " " + targetDescript;
+      this.linkElement.setAttribute("aria-label", helpText);
+      this.linkElement.setAttribute("title", helpText);
+    }
+    toggle() {
+      this.linkElement.classList.toggle("active");
+      const isActive = this.linkElement.classList.contains("active");
+      this.updateLabels(isActive);
+      if (isActive) {
+        const h = this.outputElement.getBoundingClientRect().height;
+        if (h > window.innerHeight) {
+          this.outputElement.scrollIntoView(true);
+        } else {
+          if (this.outputElement.getBoundingClientRect().bottom > window.innerHeight)
+            this.outputElement.scrollIntoView(false);
+        }
+      }
+    }
+    findOutputLocation() {
+      const invalidParents = "table, mjx-container, div.tabular-box, .runestone > .parsons";
+      let el = this.linkElement.parentElement;
+      let problemAncestor = el.closest(invalidParents);
+      while (problemAncestor && problemAncestor !== el) {
+        el = problemAncestor;
+        problemAncestor = el.closest(invalidParents);
+      }
+      return el;
+    }
+    createOutputElement() {
+      const outputId = "knowl-uid-" + this.uid;
+      const outputContentsId = "knowl-output-" + this.uid;
+      const linkTarget = this.linkElement.getAttribute("data-knowl");
+      const placeholderText = `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>Loading '${linkTarget}'</div>`;
+      const temp = document.createElement("template");
+      temp.innerHTML = placeholderText;
+      this.outputElement = temp.content.children[0];
+      const insertLoc = this.findOutputLocation(this.linkElement);
+      insertLoc.after(this.outputElement);
+    }
+    async getContent() {
+      const contentURL = this.linkElement.getAttribute("data-knowl");
+      const knowlContent = await fetch(contentURL).then((response) => response.text()).then((data) => {
+        let knowlDoc = new DOMParser().parseFromString(
+          data,
+          "text/html"
+        );
+        let tempContainer2 = knowlDoc.body;
+        let scripts = knowlDoc.querySelectorAll("head script");
+        tempContainer2.append(...scripts);
+        return tempContainer2;
+      }).catch((error) => {
+        const destination = this.linkElement.getAttribute("href");
+        const text = this.linkElement.textContent;
+        const err_message = `<div class='knowl-output__error'><div class='para'>Error fetching content. (<em>${error}</em>)</div><div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div><div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href="https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally">PreTeXt FAQ</a> for more information.</div></div>`;
+        return err_message;
+      });
+      return knowlContent;
+    }
+    handleLinkClick(event) {
+      event.preventDefault();
+      if (this.outputElement !== null) {
+        this.toggle();
+      } else {
+        this.createOutputElement();
+        const slideHandler = new SlideRevealer(
+          this.linkElement,
+          this.outputElement,
+          this.outputElement
+        );
+        this.linkElement.addEventListener("click", slideHandler);
+        let loadingTimeout = setTimeout(() => {
+          loadingTimeout = null;
+          slideHandler.onClick();
+          this.toggle();
+        }, 500);
+        const content = this.getContent();
+        content.then((tempContainer) => {
+          if (loadingTimeout !== null) {
+            clearTimeout(loadingTimeout);
+          }
+          setTimeout(() => {
+            slideHandler.onClick();
+            this.toggle();
+          }, 100);
+          const runestoneElements = tempContainer.querySelectorAll(
+            ".ptx-runestone-container"
+          );
+          [...runestoneElements].forEach((e) => {
+            const rsId = e.querySelector("[data-component]")?.id;
+            const onPage = document.getElementById(rsId);
+            if (onPage) {
+              e.innerHTML = `<div class="para">The interactive that belongs here is already on the page and cannot appear multiple times. <a href="#${rsId}">Scroll to interactive.</a>`;
+            } else {
+              window.runestoneComponents.renderOneComponent(
+                e
+              );
+            }
+          });
+          const children = [...tempContainer.children];
+          this.outputElement.innerHTML = "";
+          this.outputElement.append(...children);
+          addKnowls(this.outputElement);
+          Prism.highlightAllUnder(this.outputElement);
+          [
+            ...this.outputElement.getElementsByTagName(
+              "script"
+            )
+          ].forEach((s) => {
+            if (s.getAttribute("type") === null || s.getAttribute("type") === "text/javascript") {
+              eval(s.innerHTML);
+            }
+          });
+        }).catch((data) => {
+          console.log(
+            "Error fetching knowl content: " + data
+          );
+        });
+      }
+    }
+  };
+  function addKnowls(target) {
+    const xrefs = target.querySelectorAll("[data-knowl]");
+    for (const xref of xrefs) {
+      LinkKnowl.initializeXrefKnowl(xref);
+    }
+    const bornHiddens = target.querySelectorAll(".born-hidden-knowl");
+    for (const bhk of bornHiddens) {
+      const summary = bhk.querySelector(":scope > summary");
+      const contents = bhk.querySelector(":scope > summary + *");
+      new SlideRevealer(summary, contents, bhk);
+    }
+  }
+  function initKnowls() {
+    addKnowls(document);
+  }
+
+  // ../../js/src/lti-iframe-resizer.js
+  function initLtiIframeResizer() {
+    window.addEventListener("message", function(event2) {
+      let edata = event2.data;
+      if (typeof event2.data == "string" && event2.data.match(/lti\.frameResize/)) {
+        edata = JSON.parse(event2.data);
+      }
+      if (edata.subject === "lti.frameResize") {
+        if ("frame_id" in edata) {
+          const el = document.getElementById(edata["frame_id"]);
+          if (el) {
+            el.style.height = edata.height + "px";
+          }
+          if (edata.wrapheight && document.getElementById(edata["frame_id"] + "wrap")) {
+            document.getElementById(
+              edata["frame_id"] + "wrap"
+            ).style.height = edata.wrapheight + "px";
+          }
+        } else if ("iframe_resize_id" in edata) {
+          const el = document.getElementById(
+            edata["iframe_resize_id"]
+          );
+          if (el) {
+            el.style.height = edata.height + "px";
+          }
+        } else {
+          const iFrames = document.getElementsByTagName("iframe");
+          for (const iFrame of iFrames) {
+            if (iFrame.contentWindow === event2.source) {
+              if (edata.height) {
+                iFrame.height = edata.height;
+                iFrame.style.height = edata.height + "px";
+              }
+              if (edata.width) {
+                iFrame.width = edata.width;
+                iFrame.style.width = edata.width + "px";
+              }
+              break;
+            }
+          }
+        }
+      }
+    });
+  }
+
+  // ../../js/src/permalink.js
+  async function copyPermalink(linkNode) {
+    if (!navigator.clipboard) {
+      console.log("Error: Clipboard API not available");
+      return;
+    }
+    const elem = linkNode.parentElement;
+    if (!linkNode) {
+      console.log("Error: Something went wrong finding permalink URL");
+      return;
+    }
+    const url = linkNode.href;
+    const description = elem.getAttribute("data-description");
+    const link = `<a href="${url}">${description}</a>`;
+    const msgLink = `<a class="internal" href="${url}">${description}</a>`;
+    const textFallback = description + " \r\n" + url;
+    let copySuccess = true;
+    try {
+      await navigator.clipboard.write([
+        new ClipboardItem({
+          "text/html": new Blob([link], { type: "text/html" }),
+          "text/plain": new Blob([textFallback], { type: "text/plain" })
+        })
+      ]);
+    } catch (err) {
+      console.log(
+        "Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText",
+        err
+      );
+      copySuccess = false;
+    }
+    if (!copySuccess) {
+      try {
+        await navigator.clipboard.writeText(textFallback);
+      } catch (err) {
+        console.log(
+          "Permalink-to-clipboard using clipboard.writeText failed",
+          err
+        );
+        console.error("Failed to copy link to clipboard!");
+        return;
+      }
+    }
+    console.log(`copied '${url}' to clipboard`);
+    const copiedMsg = document.createElement("p");
+    copiedMsg.setAttribute("role", "alert");
+    copiedMsg.className = "permalink-alert";
+    copiedMsg.innerHTML = "Link to " + msgLink + " copied to clipboard";
+    elem.parentElement.insertBefore(copiedMsg, elem);
+    await new Promise((resolve) => setTimeout(resolve, 1500));
+    copiedMsg.remove();
+  }
+  function initPermalinks() {
+    const permalinks = document.querySelectorAll(".autopermalink > a");
+    permalinks.forEach((link) => {
+      link.addEventListener("click", function(event2) {
+        event2.preventDefault();
+        copyPermalink(link);
+      });
+    });
+  }
+
+  // ../../js/src/image-magnify.js
+  function outermostMatchingAncestor(el, selector) {
+    let match = null;
+    let current = el.parentElement;
+    while (current) {
+      if (current.matches(selector)) {
+        match = current;
+      }
+      current = current.parentElement;
+    }
+    return match;
+  }
+  function initImageMagnify() {
+    const imgSelector = ".image-box > img:not(.draw_on_me):not(.mag_popup), .sbspanel > img:not(.draw_on_me):not(.mag_popup), figure > img:not(.draw_on_me):not(.mag_popup), figure > div > img:not(.draw_on_me):not(.mag_popup)";
+    document.body.addEventListener("click", function(event2) {
+      const img = event2.target.closest(imgSelector);
+      if (!img) return;
+      const container = document.createElement("div");
+      container.setAttribute("style", "background:#fff;");
+      container.setAttribute("class", "mag_popup_container");
+      container.innerHTML = '<img src="' + img.src + '" style="width:100%" class="mag_popup"/>';
+      let placement = outermostMatchingAncestor(
+        img,
+        ".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)"
+      );
+      if (placement && placement.tagName === "ARTICLE") {
+        const prev = placement.previousElementSibling;
+        if (prev) {
+          placement = prev.firstElementChild || prev;
+        }
+      }
+      if (placement) {
+        placement.parentNode.insertBefore(container, placement);
+      }
+    });
+    document.body.addEventListener("click", function(event2) {
+      if (event2.target.classList.contains("mag_popup")) {
+        event2.target.parentNode.remove();
+      }
+    });
+  }
+
+  // ../../js/src/deprecated/scrollbar-width.js
+  function getScrollbarWidth() {
+    const outer = document.createElement("div");
+    outer.style.visibility = "hidden";
+    outer.style.width = "100px";
+    outer.style.msOverflowStyle = "scrollbar";
+    document.body.appendChild(outer);
+    const widthNoScroll = outer.offsetWidth;
+    outer.style.overflow = "scroll";
+    const inner = document.createElement("div");
+    inner.style.width = "100%";
+    outer.appendChild(inner);
+    const widthWithScroll = inner.offsetWidth;
+    outer.parentNode.removeChild(outer);
+    return widthNoScroll - widthWithScroll;
+  }
+
+  // ../../js/src/geogebra.js
+  function calculatorOnload() {
+    const toggle = document.getElementById("calculator-toggle");
+    if (toggle) toggle.focus();
+    const inputField = document.querySelector(
+      "input.gwt-SuggestBox.TextField"
+    );
+    if (inputField) inputField.focus();
+  }
+  function initGeoGebra() {
+    const scrollWidth = getScrollbarWidth();
+    const calcOffsetR = 5;
+    const calcOffsetB = 5;
+    document.body.addEventListener("mouseover", function(event2) {
+      if (!event2.target.closest("#geogebra-calculator canvas")) return;
+      document.body.style.overflow = "hidden";
+      document.documentElement.style.marginRight = "15px";
+      const container = document.getElementById("calculator-container");
+      if (container) {
+        container.style.right = calcOffsetR + scrollWidth + "px";
+        container.style.bottom = calcOffsetB + scrollWidth + "px";
+      }
+    });
+    document.body.addEventListener("mouseout", function(event2) {
+      if (!event2.target.closest("#geogebra-calculator canvas")) return;
+      document.body.style.overflow = "scroll";
+      document.documentElement.style.marginRight = "0";
+      const container = document.getElementById("calculator-container");
+      if (container) {
+        container.style.right = calcOffsetR + "px";
+        container.style.bottom = calcOffsetB + "px";
+      }
+    });
+    document.body.addEventListener("click", function(event2) {
+      const toggle = event2.target.closest("#calculator-toggle");
+      if (!toggle) return;
+      const container = document.getElementById("calculator-container");
+      if (!container) return;
+      if (container.style.display === "none" || !container.style.display) {
+        container.style.display = "block";
+        toggle.classList.add("open");
+        toggle.setAttribute("title", "Hide calculator");
+        toggle.setAttribute("aria-expanded", "true");
+        const existingScript = document.getElementById("create_ggb_calc");
+        if (!existingScript) {
+          const ggbScript = document.createElement("script");
+          ggbScript.id = "create_ggb_calc";
+          ggbScript.innerHTML = "ggbApp.inject('geogebra-calculator')";
+          document.body.appendChild(ggbScript);
+        } else {
+          calculatorOnload();
+        }
+      } else {
+        container.style.display = "none";
+        toggle.classList.remove("open");
+        toggle.setAttribute("title", "Show calculator");
+        toggle.setAttribute("aria-expanded", "false");
+      }
+    });
+  }
+
+  // ../../js/src/keyboard-nav.js
+  var justHitEscape = false;
+  function processWorkspace() {
+    if (typeof MathJax !== "undefined" && MathJax.typesetPromise) {
+      MathJax.typesetPromise();
+    }
+  }
+  function initKeyboardNav() {
+    document.onkeyup = function(event2) {
+      const e = event2 || window.event;
+      switch (e.keyCode) {
+        case 13:
+          justHitEscape = false;
+          if (document.activeElement.classList.contains("workspace")) {
+            processWorkspace();
+          }
+          break;
+        // Fixed: was missing, caused fallthrough to ESC handler
+        case 27: {
+          const parentSageCell = document.activeElement.closest(".sagecell_editor");
+          if (parentSageCell && !justHitEscape) {
+            justHitEscape = true;
+            setTimeout(function() {
+              justHitEscape = false;
+            }, 1e3);
+          } else if (typeof knowl_focus_stack !== "undefined" && knowl_focus_stack.length > 0) {
+            const mostRecentlyOpened = knowl_focus_stack.pop();
+            if (typeof knowl_focus_stack_uid !== "undefined") {
+              knowl_focus_stack_uid.pop();
+            }
+            mostRecentlyOpened.focus();
+          } else {
+            break;
+          }
+          break;
+        }
+      }
+    };
+  }
+  function initAnchorKnowl() {
+    if (!window.location.hash.length) return;
+    const id = window.location.hash.substring(1);
+    const anchor = document.getElementById(id);
+    if (!anchor) return;
+    if (anchor.tagName === "ARTICLE") {
+      const containedKnowl = anchor.querySelector("a[data-knowl]");
+      if (containedKnowl && containedKnowl.parentElement === anchor) {
+        containedKnowl.click();
+      }
+    } else if (anchor.hasAttribute("data-knowl")) {
+      anchor.click();
+    } else {
+      const hiddenContent = anchor.closest(".hidden-content");
+      if (hiddenContent) {
+        const refId = hiddenContent.id;
+        const knowl = document.querySelector(
+          '[data-refid="' + refId + '"]'
+        );
+        if (knowl) knowl.click();
+      }
+    }
+  }
+
+  // ../../js/src/print-preview/geometry.js
+  function toPixels(value) {
+    if (typeof value === "number") return value;
+    if (typeof value !== "string") return 0;
+    value = value.trim();
+    if (value.endsWith("px")) {
+      return parseFloat(value);
+    } else if (value.endsWith("in")) {
+      return Math.floor(parseFloat(value) * 96);
+    } else if (value.endsWith("cm")) {
+      return Math.floor(parseFloat(value) * 37.8);
+    } else if (value.endsWith("mm")) {
+      return Math.floor(parseFloat(value) * 3.78);
+    } else if (value.endsWith("pt")) {
+      return Math.floor(parseFloat(value) * (96 / 72));
+    } else {
+      return parseFloat(value) || 0;
+    }
+  }
+  function getElementTotalHeight(elem) {
+    const style = getComputedStyle(elem);
+    const marginTop = parseFloat(style.marginTop);
+    const marginBottom = parseFloat(style.marginBottom);
+    const height = elem.offsetHeight;
+    return height + marginTop + marginBottom;
+  }
+  function getElemWorkspaceHeight(elem) {
+    if (elem.classList.contains("sidebyside")) {
+      const sbspanels = elem.querySelectorAll(".sbspanel");
+      let max = 0;
+      sbspanels.forEach((panel) => {
+        const workspaces2 = panel.querySelectorAll(".workspace");
+        let totalHeight2 = 0;
+        workspaces2.forEach((workspace) => {
+          const workspaceHeight = workspace.offsetHeight;
+          if (workspaceHeight) {
+            totalHeight2 += workspaceHeight;
+          }
+        });
+        if (totalHeight2 > max) {
+          max = totalHeight2;
+        }
+      });
+      return max;
+    }
+    let columns = 1;
+    if (elem.classList.contains("exercisegroup")) {
+      for (let i = 2; i <= 6; i++) {
+        if (elem.querySelector(`.cols${i}`)) {
+          columns = i;
+          break;
+        }
+      }
+    }
+    const workspaces = elem.querySelectorAll(".workspace");
+    let totalHeight = 0;
+    workspaces.forEach((ws) => {
+      const workspaceHeight = ws.offsetHeight;
+      if (workspaceHeight) {
+        totalHeight += workspaceHeight;
+      }
+    });
+    return totalHeight / columns;
+  }
+  function setPageGeometryCSS({ paperSize, margins }) {
+    const existingStyle = document.getElementById("page-geometry-css");
+    if (existingStyle) {
+      existingStyle.remove();
+    }
+    const wsWidth = paperSize === "letter" ? "816px" : "794px";
+    const wsHeight = paperSize === "letter" ? "1056px" : "1123px";
+    const style = document.createElement("style");
+    style.id = "page-geometry-css";
+    style.textContent = `
+        :root {
+            --ws-width: ${wsWidth};
+            --ws-height: ${wsHeight};
+            --ws-top-margin: ${margins.top}px;
+            --ws-right-margin: ${margins.right}px;
+            --ws-bottom-margin: ${margins.bottom}px;
+            --ws-left-margin: ${margins.left}px;
+        }
+        @page {
+            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);
+        }
+    `;
+    document.head.appendChild(style);
+  }
+
+  // ../../js/src/print-preview/workspace.js
+  function setInitialWorkspaceHeights() {
+    const workspaces = document.querySelectorAll(".workspace");
+    workspaces.forEach((ws) => {
+      ws.style.height = ws.getAttribute("data-space") || "0px";
+      ws.setAttribute("contenteditable", "true");
+    });
+  }
+  function adjustWorkspaceToFitPage({ paperSize, margins }) {
+    const highlightCheckbox = document.getElementById(
+      "highlight-workspace-checkbox"
+    );
+    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;
+    if (wasHighlighted) {
+      toggleWorkspaceHighlight(false);
+    }
+    let paperWidth, paperHeight;
+    if (paperSize === "a4" || document.body.classList.contains("a4")) {
+      paperWidth = 794;
+      paperHeight = 1122.5;
+    } else {
+      paperWidth = 816;
+      paperHeight = 1056;
+    }
+    const paperContentHeight = paperHeight - (margins.top + margins.bottom);
+    setInitialWorkspaceHeights();
+    const pages = document.querySelectorAll(".onepage");
+    pages.forEach((page) => {
+      page.style.width = paperWidth + "px";
+      const rows = page.children;
+      let totalContentHeight = 0;
+      let totalWorkspaceHeight = 0;
+      for (const row of rows) {
+        totalContentHeight += getElementTotalHeight(row);
+        totalWorkspaceHeight += getElemWorkspaceHeight(row);
+      }
+      if (totalWorkspaceHeight === 0) {
+        page.style.width = "";
+        return;
+      }
+      const extraHeight = paperContentHeight - totalContentHeight;
+      const workspaceAdjustmentFactor = (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;
+      const pageWorkspaces = page.querySelectorAll(".workspace");
+      pageWorkspaces.forEach((ws) => {
+        const originalHeight = ws.offsetHeight;
+        const newHeight = originalHeight * workspaceAdjustmentFactor;
+        ws.style.height = newHeight + "px";
+      });
+      page.style.width = "";
+    });
+    if (wasHighlighted) {
+      toggleWorkspaceHighlight(true);
+    }
+  }
+  function toggleWorkspaceHighlight(isChecked) {
+    if (isChecked) {
+      document.body.classList.add("highlight-workspace");
+      if (!document.querySelector(".workspace-container")) {
+        document.querySelectorAll(".workspace").forEach((workspace) => {
+          const container = document.createElement("div");
+          container.classList.add("workspace-container");
+          container.style.height = window.getComputedStyle(workspace).height;
+          const original = document.createElement("div");
+          original.classList.add("original-workspace");
+          const originalHeight = workspace.getAttribute("data-space") || "0px";
+          original.setAttribute(
+            "title",
+            "Author-specified workspace height (" + originalHeight + ")"
+          );
+          original.style.height = originalHeight;
+          container.appendChild(original);
+          if (original.offsetHeight > workspace.offsetHeight) {
+            original.classList.add("warning");
+          }
+          workspace.parentNode.insertBefore(container, workspace);
+          container.appendChild(workspace);
+        });
+      }
+    } else {
+      document.body.classList.remove("highlight-workspace");
+      document.querySelectorAll(".workspace-container").forEach((container) => {
+        const workspace = container.querySelector(".workspace");
+        container.parentNode.insertBefore(workspace, container);
+        container.remove();
+      });
+    }
+  }
+
+  // ../../js/src/print-preview/page-breaks.js
+  function findPageBreaks(rows, pageHeight) {
+    let pageBreaks = [];
+    let minCost = Array(rows.length + 1).fill(Infinity);
+    minCost[rows.length] = 0;
+    let nextPageBreak = Array(rows.length).fill(-1);
+    for (let i = rows.length - 1; i >= 0; i--) {
+      let cumulativeHeight = 0;
+      for (let j = i; j < rows.length; j++) {
+        cumulativeHeight += rows[j].height;
+        if (cumulativeHeight > pageHeight) {
+          if (j === i) {
+            minCost[i] = 0;
+            nextPageBreak[i] = i + 1;
+          }
+          break;
+        }
+        const cost = (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];
+        if (cost < minCost[i]) {
+          minCost[i] = cost;
+          nextPageBreak[i] = j + 1;
+        }
+      }
+    }
+    let nextPage = 1;
+    while (nextPage < rows.length) {
+      pageBreaks.push(nextPageBreak[nextPage]);
+      nextPage = nextPageBreak[nextPage];
+    }
+    return pageBreaks;
+  }
+
+  // ../../js/src/print-preview/pages.js
+  function flattenParagraphsSections(printout) {
+    const paragraphsSections = printout.querySelectorAll(
+      "section.paragraphs"
+    );
+    paragraphsSections.forEach((section) => {
+      const parent = section.parentNode;
+      while (section.firstChild) {
+        parent.insertBefore(section.firstChild, section);
+      }
+      parent.removeChild(section);
+    });
+  }
+  function waitForImages(container, timeoutMs = 5e3) {
+    const images = container.querySelectorAll("img");
+    const promises = [];
+    for (const img of images) {
+      if (!img.complete) {
+        promises.push(
+          new Promise((resolve) => {
+            img.addEventListener("load", resolve, { once: true });
+            img.addEventListener("error", resolve, { once: true });
+          })
+        );
+      }
+    }
+    if (promises.length === 0) return Promise.resolve();
+    return Promise.race([
+      Promise.all(promises),
+      new Promise((resolve) => setTimeout(resolve, timeoutMs))
+    ]);
+  }
+  function adjustPrintoutPages() {
+    const printout = document.querySelector(
+      "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+    const pages = printout.querySelectorAll(".onepage");
+    if (pages.length === 0) return;
+    const firstPage = pages[0];
+    const lastPage = pages[pages.length - 1];
+    const pageFirstChild = firstPage.firstChild;
+    let currentChild = printout.firstChild;
+    while (currentChild && currentChild !== firstPage) {
+      const nextChild2 = currentChild.nextSibling;
+      firstPage.insertBefore(currentChild, pageFirstChild);
+      currentChild = nextChild2;
+    }
+    let nextChild = lastPage.nextSibling;
+    while (nextChild) {
+      const tempChild = nextChild;
+      nextChild = nextChild.nextSibling;
+      lastPage.appendChild(tempChild);
+    }
+  }
+  function createPrintoutPages(margins) {
+    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);
+    const conservativeContentWidth = 794 - (margins.left + margins.right);
+    const printout = document.querySelector(
+      "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+    printout.style.width = (conservativeContentWidth + margins.left + margins.right).toString() + "px";
+    setInitialWorkspaceHeights(printout);
+    let rows = [];
+    for (const child of printout.children) {
+      if (child.classList.contains("sidebyside")) {
+        rows.push(child);
+      } else if (child.querySelector(".task")) {
+        rows.push(child);
+        const tasks = child.querySelectorAll(".task, .conclusion");
+        for (let i = 0; i < tasks.length; i++) {
+          let parent = tasks[i].parentElement;
+          let grandparent = parent.parentElement;
+          if (grandparent.classList.contains("task")) {
+            tasks[i].classList.add("subsubtask");
+          } else if (parent.classList.contains("task")) {
+            tasks[i].classList.add("subtask");
+          }
+        }
+        for (let i = tasks.length - 1; i > 0; i--) {
+          printout.insertBefore(tasks[i], child.nextSibling);
+        }
+      } else {
+        rows.push(child);
+      }
+    }
+    let blockList = [];
+    for (const row of rows) {
+      let blockHeight = getElementTotalHeight(row);
+      if (blockHeight === 0) continue;
+      let totalWorkspaceHeight = 0;
+      if (row.querySelector(".workspace")) {
+        totalWorkspaceHeight = getElemWorkspaceHeight(row);
+      }
+      blockList.push({
+        elem: row,
+        height: blockHeight,
+        workspaceHeight: totalWorkspaceHeight
+      });
+    }
+    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);
+    for (let i = 0; i < pageBreaks.length; i++) {
+      const pageDiv = document.createElement("section");
+      pageDiv.classList.add("onepage");
+      if (i === 0) pageDiv.classList.add("firstpage");
+      if (i === pageBreaks.length - 1) pageDiv.classList.add("lastpage");
+      const start = pageBreaks[i - 1] || 0;
+      const end = pageBreaks[i];
+      for (let j = start; j < end; j++) {
+        pageDiv.appendChild(blockList[j].elem);
+      }
+      printout.appendChild(pageDiv);
+    }
+    for (const child of Array.from(printout.children)) {
+      if (!child.classList.contains("onepage")) {
+        printout.removeChild(child);
+      }
+    }
+  }
+
+  // ../../js/src/print-preview/headers-footers.js
+  function addHeadersAndFootersToPrintout() {
+    const printout = document.querySelector(
+      "section.worksheet, section.handout"
+    );
+    if (!printout) return;
+    const pages = printout.querySelectorAll(".onepage");
+    pages.forEach((page, index) => {
+      const isFirstPage = index === 0;
+      const headerDiv = document.createElement("div");
+      headerDiv.classList.add(
+        isFirstPage ? "first-page-header" : "running-header",
+        "hidden"
+      );
+      headerDiv.innerHTML = `<div class="header-left" contenteditable="true"></div><div class="header-center" contenteditable="true"></div><div class="header-right" contenteditable="true"></div>`;
+      page.insertBefore(headerDiv, page.firstChild);
+      const footerDiv = document.createElement("div");
+      footerDiv.classList.add(
+        isFirstPage ? "first-page-footer" : "running-footer",
+        "hidden"
+      );
+      footerDiv.innerHTML = `<div class="footer-left" contenteditable="true"></div><div class="footer-center" contenteditable="true"></div><div class="footer-right" contenteditable="true"></div>`;
+      page.appendChild(footerDiv);
+    });
+    const keys = [
+      "header-first-left",
+      "header-first-center",
+      "header-first-right",
+      "footer-first-left",
+      "footer-first-center",
+      "footer-first-right",
+      "header-running-left",
+      "header-running-center",
+      "header-running-right",
+      "footer-running-left",
+      "footer-running-center",
+      "footer-running-right"
+    ];
+    const content2 = {};
+    keys.forEach((key) => {
+      content2[key] = localStorage.getItem(key) || printout.getAttribute(`data-${key}`) || "";
+    });
+    const firstHeader = document.querySelector(".first-page-header");
+    if (firstHeader) {
+      firstHeader.querySelector(".header-left").innerHTML = content2["header-first-left"];
+      firstHeader.querySelector(".header-center").innerHTML = content2["header-first-center"];
+      firstHeader.querySelector(".header-right").innerHTML = content2["header-first-right"];
+    }
+    const firstFooter = document.querySelector(".first-page-footer");
+    if (firstFooter) {
+      firstFooter.querySelector(".footer-left").innerHTML = content2["footer-first-left"];
+      firstFooter.querySelector(".footer-center").innerHTML = content2["footer-first-center"];
+      firstFooter.querySelector(".footer-right").innerHTML = content2["footer-first-right"];
+    }
+    document.querySelectorAll(".running-header").forEach((headerDiv) => {
+      headerDiv.querySelector(".header-left").innerHTML = content2["header-running-left"];
+      headerDiv.querySelector(".header-center").innerHTML = content2["header-running-center"];
+      headerDiv.querySelector(".header-right").innerHTML = content2["header-running-right"];
+    });
+    document.querySelectorAll(".running-footer").forEach((footerDiv) => {
+      footerDiv.querySelector(".footer-left").innerHTML = content2["footer-running-left"];
+      footerDiv.querySelector(".footer-center").innerHTML = content2["footer-running-center"];
+      footerDiv.querySelector(".footer-right").innerHTML = content2["footer-running-right"];
+    });
+    const selectorMap = {
+      "header-first-left": ".first-page-header .header-left",
+      "header-first-center": ".first-page-header .header-center",
+      "header-first-right": ".first-page-header .header-right",
+      "footer-first-left": ".first-page-footer .footer-left",
+      "footer-first-center": ".first-page-footer .footer-center",
+      "footer-first-right": ".first-page-footer .footer-right",
+      "header-running-left": ".running-header .header-left",
+      "header-running-center": ".running-header .header-center",
+      "header-running-right": ".running-header .header-right",
+      "footer-running-left": ".running-footer .footer-left",
+      "footer-running-center": ".running-footer .footer-center",
+      "footer-running-right": ".running-footer .footer-right"
+    };
+    keys.forEach((key) => {
+      const elements = document.querySelectorAll(selectorMap[key]);
+      elements.forEach((elem) => {
+        elem.addEventListener("input", () => {
+          localStorage.setItem(key, elem.innerHTML);
+        });
+      });
+    });
+  }
+
+  // ../../js/src/print-preview/paper-size.js
+  function getPaperSize() {
+    let paperSize = localStorage.getItem("papersize");
+    if (paperSize) return paperSize;
+    try {
+      fetch("https://ipapi.co/json/").then((response) => response.json()).then((data) => {
+        const continent = data && data.continent_code ? data.continent_code : "";
+        paperSize = continent === "NA" || continent === "SA" ? "letter" : "a4";
+        const radio = document.querySelector(
+          `input[name="papersize"][value="${paperSize}"]`
+        );
+        if (radio) {
+          radio.checked = true;
+          localStorage.setItem("papersize", paperSize);
+        }
+        document.body.classList.remove("a4", "letter");
+        document.body.classList.add(paperSize);
+      }).catch((err) => {
+        throw err;
+      });
+    } catch (e) {
+      const radio = document.querySelector(
+        'input[name="papersize"][value="letter"]'
+      );
+      if (radio) radio.checked = true;
+    }
+    return paperSize || "letter";
+  }
+
+  // ../../js/src/print-preview/section-swap.js
+  async function loadPrintout(printableSectionID) {
+    const themeStylesheetLink = document.querySelector(
+      'link[rel="stylesheet"][href*="theme"]'
+    );
+    const themeStylesheetHref = themeStylesheetLink ? themeStylesheetLink.getAttribute("href") : null;
+    if (themeStylesheetHref) {
+      const printStylesheetHref = themeStylesheetHref.replace(
+        /theme.*\.css/,
+        "print-worksheet.css"
+      );
+      themeStylesheetLink.setAttribute("href", printStylesheetHref);
+      await new Promise((resolve) => {
+        themeStylesheetLink.addEventListener("load", resolve, {
+          once: true
+        });
+      });
+    }
+    const printableSection = document.getElementById(printableSectionID);
+    if (!printableSection) {
+      console.error("No section found with ID:", printableSectionID);
+      return;
+    }
+    const ptxContent = document.querySelector(".ptx-content");
+    const existingSections = ptxContent.querySelectorAll(":scope > section");
+    existingSections.forEach((sec) => ptxContent.removeChild(sec));
+    ptxContent.appendChild(printableSection);
+  }
+
+  // ../../js/src/print-preview/solutions.js
+  function rewriteSolutions() {
+    const bornHiddenKnowls = document.querySelectorAll(
+      ".worksheet details, .handout details"
+    );
+    bornHiddenKnowls.forEach(function(detail) {
+      const summary = detail.querySelector("summary");
+      const content2 = detail.innerHTML.replace(summary.outerHTML, "");
+      const div = document.createElement("div");
+      div.classList = detail.classList;
+      if (summary) {
+        const title = document.createElement("h5");
+        title.innerHTML = summary.innerHTML;
+        div.appendChild(title);
+      }
+      const body = document.createElement("div");
+      body.innerHTML = content2;
+      div.appendChild(body);
+      detail.parentNode.replaceChild(div, detail);
+    });
+  }
+
+  // ../../js/src/print-preview/index.js
+  async function initPrintPreview() {
+    const urlParams = new URLSearchParams(window.location.search);
+    if (!urlParams.has("printpreview")) return;
+    const printableSectionID = urlParams.get("printpreview");
+    await loadPrintout(printableSectionID);
+    const marginList = document.querySelector("section.worksheet, section.handout").getAttribute("data-margins").split(" ");
+    const margins = {
+      top: toPixels(marginList[0] || "0.75in"),
+      right: toPixels(marginList[1] || "0.75in"),
+      bottom: toPixels(marginList[2] || "0.75in"),
+      left: toPixels(marginList[3] || "0.75in")
+    };
+    rewriteSolutions();
+    let paperSize = getPaperSize();
+    if (paperSize) {
+      const radio = document.querySelector(
+        `input[name="papersize"][value="${paperSize}"]`
+      );
+      if (radio) radio.checked = true;
+      document.body.classList.remove("a4", "letter");
+      document.body.classList.add(paperSize);
+      setPageGeometryCSS({ paperSize, margins });
+    }
+    const papersizeRadios = document.querySelectorAll(
+      'input[name="papersize"]'
+    );
+    papersizeRadios.forEach((radio) => {
+      radio.addEventListener("change", function() {
+        if (this.checked) {
+          document.body.classList.remove("a4", "letter");
+          document.body.classList.add(this.value);
+          localStorage.setItem("papersize", this.value);
+          setPageGeometryCSS({ paperSize: this.value, margins });
+          adjustWorkspaceToFitPage({
+            paperSize: this.value,
+            margins
+          });
+        }
+      });
+    });
+    for (const solutionType of ["hint", "answer", "solution"]) {
+      const checkbox = document.getElementById(
+        `hide-${solutionType}-checkbox`
+      );
+      if (!checkbox) continue;
+      const storageKey = `hide-${solutionType}`;
+      if ((solutionType === "answer" || solutionType === "solution") && !localStorage.getItem(storageKey)) {
+        checkbox.checked = true;
+        localStorage.setItem(storageKey, "true");
+      }
+      checkbox.checked = localStorage.getItem(storageKey) === "true";
+      document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {
+        if (checkbox.checked) {
+          elem.classList.add("hidden");
+        } else {
+          elem.classList.remove("hidden");
+        }
+      });
+      checkbox.addEventListener("change", function() {
+        localStorage.setItem(storageKey, this.checked);
+        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {
+          if (checkbox.checked) {
+            elem.classList.add("hidden");
+          } else {
+            elem.classList.remove("hidden");
+          }
+          adjustWorkspaceToFitPage({ paperSize, margins });
+        });
+      });
+    }
+    const printoutSection = document.querySelector(
+      "section.worksheet, section.handout"
+    );
+    if (printoutSection) {
+      flattenParagraphsSections(printoutSection);
+      await waitForImages(printoutSection);
+    }
+    if (document.querySelector(".onepage")) {
+      adjustPrintoutPages();
+    } else {
+      createPrintoutPages(margins);
+    }
+    addHeadersAndFootersToPrintout();
+    for (const hf of [
+      "first-page-header",
+      "running-header",
+      "first-page-footer",
+      "running-footer"
+    ]) {
+      const checkbox = document.getElementById(`print-${hf}-checkbox`);
+      if (!checkbox) continue;
+      checkbox.checked = localStorage.getItem(`print-${hf}`) === "true";
+      document.querySelectorAll(`.${hf}`).forEach((elem) => {
+        if (checkbox.checked) {
+          elem.classList.remove("hidden");
+        } else {
+          elem.classList.add("hidden");
+        }
+      });
+      checkbox.addEventListener("change", function() {
+        localStorage.setItem(`print-${hf}`, this.checked);
+        document.querySelectorAll(`.${hf}`).forEach((elem) => {
+          if (checkbox.checked) {
+            elem.classList.remove("hidden");
+          } else {
+            elem.classList.add("hidden");
+          }
+          adjustWorkspaceToFitPage({ paperSize, margins });
+        });
+      });
+    }
+    adjustWorkspaceToFitPage({ paperSize, margins });
+    const highlightCheckbox = document.getElementById(
+      "highlight-workspace-checkbox"
+    );
+    if (highlightCheckbox) {
+      highlightCheckbox.checked = localStorage.getItem("highlightWorkspace") === "true";
+      highlightCheckbox.addEventListener("change", function() {
+        localStorage.setItem("highlightWorkspace", this.checked);
+        toggleWorkspaceHighlight(this.checked);
+      });
+      toggleWorkspaceHighlight(highlightCheckbox.checked);
+    }
+  }
+
+  // ../../js/src/theme.js
+  function isDarkMode() {
+    if (document.documentElement.dataset.darkmode === "disabled") return false;
+    const currentTheme = localStorage.getItem("theme");
+    if (currentTheme === "dark") return true;
+    if (currentTheme === "light") return false;
+    return window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches;
+  }
+  function setDarkMode(isDark) {
+    if (document.documentElement.dataset.darkmode === "disabled") return;
+    const parentHtml = document.documentElement;
+    const iframes = document.querySelectorAll(
+      "iframe[data-dark-mode-enabled]"
+    );
+    if (isDark) {
+      parentHtml.classList.add("dark-mode");
+    } else {
+      parentHtml.classList.remove("dark-mode");
+    }
+    for (const iframe of iframes) {
+      try {
+        const iframeHtml = iframe.contentWindow.document.documentElement;
+        if (isDark) {
+          iframeHtml.classList.add("dark-mode");
+        } else {
+          iframeHtml.classList.remove("dark-mode");
+        }
+      } catch (err) {
+        console.warn("Dark mode sync to iframe failed:", err);
+      }
+    }
+    const modeButton = document.getElementById("light-dark-button");
+    if (modeButton) {
+      modeButton.querySelector(".icon").innerText = isDark ? "light_mode" : "dark_mode";
+      modeButton.querySelector(".name").innerText = isDark ? "Light Mode" : "Dark Mode";
+    }
+  }
+  function initThemeToggle() {
+    setDarkMode(isDarkMode());
+    const isDark = isDarkMode();
+    setDarkMode(isDark);
+    const modeButton = document.getElementById("light-dark-button");
+    if (modeButton) {
+      modeButton.addEventListener("click", function() {
+        const wasDark = isDarkMode();
+        setDarkMode(!wasDark);
+        localStorage.setItem("theme", wasDark ? "light" : "dark");
+      });
+    }
+  }
+
+  // ../../js/src/embed.js
+  function initShareButton() {
+    const shareButton = document.getElementById("embed-button");
+    if (!shareButton) return;
+    const sharePopup = document.getElementById("embed-popup");
+    const embedCode = "<iframe src='" + window.location.href + "?embed' width='100%' height='1000px' frameborder='0'></iframe>";
+    const embedTextbox = document.getElementById("embed-code-textbox");
+    if (embedTextbox) {
+      embedTextbox.value = embedCode;
+    }
+    shareButton.addEventListener("click", function() {
+      sharePopup.classList.toggle("hidden");
+    });
+    const copyButton = document.getElementById("copy-embed-button");
+    if (copyButton) {
+      copyButton.addEventListener("click", function() {
+        const textbox = document.getElementById("embed-code-textbox");
+        if (textbox) {
+          navigator.clipboard.writeText(embedCode).then(() => {
+            console.log("Embed code copied to clipboard!");
+          }).catch((err) => {
+            console.error("Failed to copy embed code: ", err);
+          });
+          copyButton.querySelector(".icon").innerText = "library_add_check";
+          setTimeout(function() {
+            copyButton.querySelector(".icon").innerText = "content_copy";
+            sharePopup.classList.add("hidden");
+          }, 450);
+        }
+      });
+    }
+  }
+  function initEmbedMode() {
+    const urlParams = new URLSearchParams(window.location.search);
+    if (!urlParams.has("embed")) return;
+    if (urlParams.get("embed") === "dark") {
+      setDarkMode(true);
+    } else {
+      setDarkMode(false);
+    }
+    const elemsToHide = [
+      "ptx-navbar",
+      "ptx-masthead",
+      "ptx-page-footer",
+      "ptx-sidebar",
+      "ptx-content-footer"
+    ];
+    for (const id of elemsToHide) {
+      const elem = document.getElementById(id);
+      if (elem) {
+        elem.classList.add("hidden");
+      }
+    }
+  }
+
+  // ../../js/src/code-copy.js
+  function initCodeCopyButtons() {
+    const elements = document.querySelectorAll(".clipboardable");
+    for (const el of elements) {
+      const div = document.createElement("div");
+      div.classList.add("clipboardable");
+      el.classList.remove("clipboardable");
+      el.replaceWith(div);
+      div.insertAdjacentElement("afterbegin", el);
+      div.insertAdjacentHTML(
+        "beforeend",
+        `
+    <button class="code-copy" title="Copy code" role="button" aria-label="Copy code" >
+        <span class="copyicon material-symbols-outlined">content_copy</span>
+        <span class="checkmark material-symbols-outlined">check</span>
+    </button>
+            `.trim()
+      );
+    }
+  }
+  function initCodeCopyHandler() {
+    document.addEventListener("click", (ev) => {
+      const codeBox = ev.target.closest(".clipboardable");
+      if (!navigator.clipboard || !codeBox) return;
+      const button = ev.target.closest(".code-copy");
+      if (!button) return;
+      const preContent = codeBox.querySelector("pre").textContent;
+      navigator.clipboard.writeText(preContent);
+      button.classList.toggle("copied");
+      setTimeout(() => button.classList.toggle("copied"), 1e3);
+    });
+  }
+
+  // ../../js/src/deprecated/auto-id.js
+  function initAutoId() {
+    const noIdParagraphs = document.querySelectorAll(".main p:not([id])");
+    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {
+      const e = noIdParagraphs[n];
+      if (e.hasAttribute("id")) continue;
+      if (e.classList.contains("watermark")) continue;
+      const prevParagraphs = [];
+      let sibling = e.previousElementSibling;
+      while (sibling) {
+        if (sibling.tagName === "P") {
+          prevParagraphs.push(sibling);
+        }
+        sibling = sibling.previousElementSibling;
+      }
+      if (prevParagraphs.length === 0) continue;
+      let partsFound = 1;
+      const partsToId = [e];
+      for (let i = 0; i < prevParagraphs.length; ++i) {
+        const thisPrevious = prevParagraphs[i];
+        if (!thisPrevious.hasAttribute("id")) {
+          partsToId.unshift(thisPrevious);
+        } else {
+          const baseId = thisPrevious.id;
+          for (let j = 0; j < partsToId.length; ++j) {
+            ++partsFound;
+            const nextId = baseId + "-part" + partsFound.toString();
+            partsToId[j].setAttribute("id", nextId);
+          }
+          break;
+        }
+      }
+    }
+  }
+
+  // ../../js/src/deprecated/video-magnify.js
+  function initVideoMagnify() {
+    const allIframes = document.querySelectorAll("body iframeXXXX");
+    for (let i = 0; i < allIframes.length; i++) {
+      const thisItem = allIframes[i];
+      const thisItemSrc = thisItem.src;
+      if (!thisItemSrc.includes("youtube")) continue;
+      const thisItemId = thisItem.id;
+      const thisItemWidth = thisItem.width;
+      const thisItemHeight = thisItem.height;
+      if (thisItemHeight < 150) continue;
+      const emptyDiv = document.createElement("div");
+      const videomagContainer = document.createElement("div");
+      const parentTag = thisItem.parentElement.tagName;
+      if (parentTag === "FIGURE") {
+        videomagContainer.setAttribute("class", "videobig");
+      } else {
+        videomagContainer.setAttribute("class", "videobig nofigure");
+      }
+      videomagContainer.setAttribute("video-id", thisItemId);
+      videomagContainer.setAttribute("data-width", thisItemWidth);
+      videomagContainer.setAttribute("data-height", thisItemHeight);
+      videomagContainer.innerHTML = "fit width";
+      thisItem.insertAdjacentElement("beforebegin", emptyDiv);
+      thisItem.insertAdjacentElement("beforebegin", videomagContainer);
+      thisItem.insertAdjacentElement("beforebegin", emptyDiv);
+    }
+    document.body.addEventListener("click", function(event2) {
+      const bigBtn = event2.target.closest(".videobig");
+      if (bigBtn) {
+        const videoId = bigBtn.getAttribute("video-id");
+        const video = document.getElementById(videoId);
+        const originalWidth = parseInt(bigBtn.getAttribute("data-width"));
+        const originalHeight = parseInt(bigBtn.getAttribute("data-height"));
+        const browserWidth = window.innerWidth;
+        const widthRatio = browserWidth / originalWidth;
+        video.setAttribute("width", widthRatio * originalWidth);
+        video.setAttribute("height", widthRatio * originalHeight);
+        video.setAttribute(
+          "style",
+          "position:relative; left:-260px; z-index:1000"
+        );
+        bigBtn.setAttribute("class", "videosmall");
+        bigBtn.innerHTML = "make small";
+        return;
+      }
+      const smallBtn = event2.target.closest(".videosmall");
+      if (smallBtn) {
+        const videoId = smallBtn.getAttribute("video-id");
+        const video = document.getElementById(videoId);
+        const originalWidth = smallBtn.getAttribute("data-width");
+        const originalHeight = smallBtn.getAttribute("data-height");
+        video.removeAttribute("style");
+        video.setAttribute("width", originalWidth);
+        video.setAttribute("height", originalHeight);
+        smallBtn.setAttribute("class", "videobig");
+        smallBtn.innerHTML = "fit width";
+      }
+    });
+  }
+
+  // ../../js/src/pretext-core-entry.js
+  setDarkMode(isDarkMode());
+  window.addEventListener("DOMContentLoaded", function() {
+    initToc();
+    initFocusedToc();
+    initScrollToc();
+    initPermalinks();
+    initThemeToggle();
+    initShareButton();
+    initEmbedMode();
+    initCodeCopyButtons();
+    initPrintPreview();
+  });
+  window.addEventListener("load", function() {
+    initKnowls();
+    initLtiIframeResizer();
+    initImageMagnify();
+    initGeoGebra();
+    initKeyboardNav();
+    initAnchorKnowl();
+    initAutoId();
+    initVideoMagnify();
+  });
+  initCodeCopyHandler();
+})();
+//# sourceMappingURL=pretext-core.js.map
diff --git a/js/dist/pretext-core.js.map b/js/dist/pretext-core.js.map
new file mode 100644
index 000000000..28843c82b
--- /dev/null
+++ b/js/dist/pretext-core.js.map
@@ -0,0 +1,7 @@
+{
+  "version": 3,
+  "sources": ["../src/toc.js", "../src/knowl.js", "../src/lti-iframe-resizer.js", "../src/permalink.js", "../src/image-magnify.js", "../src/deprecated/scrollbar-width.js", "../src/geogebra.js", "../src/keyboard-nav.js", "../src/print-preview/geometry.js", "../src/print-preview/workspace.js", "../src/print-preview/page-breaks.js", "../src/print-preview/pages.js", "../src/print-preview/headers-footers.js", "../src/print-preview/paper-size.js", "../src/print-preview/section-swap.js", "../src/print-preview/solutions.js", "../src/print-preview/index.js", "../src/theme.js", "../src/embed.js", "../src/code-copy.js", "../src/deprecated/auto-id.js", "../src/deprecated/video-magnify.js", "../src/pretext-core-entry.js"],
+  "sourcesContent": ["/**\r\n * TOC, sidebar, and navigation (from pretext.js).\r\n *\r\n * Manages the table-of-contents sidebar: scroll-to-active, toggle\r\n * visibility, auto-collapse, focused/expandable TOC items, and\r\n * hash-based navigation.\r\n */\r\n\r\nfunction getOffsetTop(e) {\r\n    if (!e) return 0;\r\n    return getOffsetTop(e.offsetParent) + e.offsetTop;\r\n}\r\n\r\nfunction scrollTocToActive() {\r\n    let fileNameWHash = window.location.href.split(\"/\").pop();\r\n    let fileName = fileNameWHash.split(\"#\")[0];\r\n\r\n    let tocEntry = document.querySelector(\r\n        '#ptx-toc a[href=\"' + fileName + '\"]'\r\n    );\r\n    if (!tocEntry) return;\r\n\r\n    let tocEntryTop = 0;\r\n    if (fileNameWHash.includes(\"#\")) {\r\n        let tocEntryWHash = document.querySelector(\r\n            '#ptx-toc a[href=\"' + fileNameWHash + '\"]'\r\n        );\r\n        if (tocEntryWHash) {\r\n            tocEntry\r\n                .closest(\"li\")\r\n                .querySelectorAll(\"li\")\r\n                .forEach((li) => {\r\n                    li.classList.remove(\"active\");\r\n                });\r\n            tocEntryWHash.closest(\"li\").classList.add(\"active\");\r\n            tocEntryTop = getOffsetTop(tocEntryWHash);\r\n        }\r\n    }\r\n    if (!tocEntryTop) {\r\n        tocEntryTop = getOffsetTop(tocEntry);\r\n    }\r\n\r\n    tocEntry.closest(\"li\").classList.add(\"active\");\r\n    let toc = document.querySelector(\"#ptx-toc\");\r\n    let tocTop = getOffsetTop(toc);\r\n    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;\r\n}\r\n\r\nfunction toggletoc() {\r\n    const thesidebar = document.getElementById(\"ptx-sidebar\");\r\n    if (\r\n        thesidebar.classList.contains(\"hidden\") ||\r\n        thesidebar.classList.contains(\"visible\")\r\n    ) {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else if (thesidebar.offsetParent === null) {\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n    }\r\n    scrollTocToActive();\r\n}\r\n\r\nfunction samePageLink(a) {\r\n    if (!(a instanceof HTMLAnchorElement)) return false;\r\n    try {\r\n        const linkUrl = new URL(a.href, document.baseURI);\r\n        const currentUrl = new URL(window.location.href);\r\n        const sameDocument =\r\n            linkUrl.origin === currentUrl.origin &&\r\n            linkUrl.pathname === currentUrl.pathname &&\r\n            linkUrl.search === currentUrl.search;\r\n        return sameDocument && !!linkUrl.hash;\r\n    } catch (e) {\r\n        return false;\r\n    }\r\n}\r\n\r\nfunction getTOCItemType(item) {\r\n    for (let className of item.classList) {\r\n        if (\r\n            className !== \"toc-item\" &&\r\n            className.length > 3 &&\r\n            className.slice(0, 4) === \"toc-\"\r\n        )\r\n            return className.slice(4);\r\n    }\r\n    return \"\";\r\n}\r\n\r\nfunction getTOCItemDepth(item) {\r\n    let depth = 0;\r\n    let curParent = item.closest(\".toc-item-list\");\r\n    while (curParent !== null) {\r\n        depth++;\r\n        curParent = curParent.parentElement.closest(\".toc-item-list\");\r\n    }\r\n    return depth;\r\n}\r\n\r\nfunction toggleTOCItem(expander) {\r\n    let listItem = expander.closest(\".toc-item\");\r\n    listItem.classList.toggle(\"expanded\");\r\n    let expanded = listItem.classList.contains(\"expanded\");\r\n    let itemType = getTOCItemType(listItem);\r\n\r\n    if (expanded) {\r\n        expander.title = \"Close\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    } else {\r\n        expander.title = \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    }\r\n\r\n    for (const childUL of listItem.querySelectorAll(\r\n        \":scope > ul.toc-item-list\"\r\n    )) {\r\n        for (const childItem of childUL.querySelectorAll(\r\n            \":scope > li.toc-item\"\r\n        )) {\r\n            if (expanded) {\r\n                childItem.classList.add(\"visible\");\r\n                childItem.classList.remove(\"hidden\");\r\n            } else {\r\n                childItem.classList.remove(\"visible\");\r\n                childItem.classList.add(\"hidden\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initToc() {\r\n    const thetocbutton = document.getElementsByClassName(\"toc-toggle\")[0];\r\n    if (thetocbutton) {\r\n        thetocbutton.addEventListener(\"click\", (e) => {\r\n            toggletoc();\r\n            e.stopPropagation();\r\n        });\r\n    }\r\n\r\n    // Auto-collapse TOC when clicking outside\r\n    if (\r\n        getComputedStyle(document.documentElement).getPropertyValue(\r\n            \"--auto-collapse-toc\"\r\n        ) == \"yes\"\r\n    ) {\r\n        const sidebar = document.getElementById(\"ptx-sidebar\");\r\n\r\n        window.addEventListener(\"click\", function (event) {\r\n            if (sidebar.classList.contains(\"visible\")) {\r\n                if (!event.composedPath().includes(sidebar)) {\r\n                    toggletoc();\r\n                }\r\n            }\r\n        });\r\n\r\n        sidebar.addEventListener(\"click\", function (event) {\r\n            if (samePageLink(event.target.closest(\"a\"))) {\r\n                toggletoc();\r\n            }\r\n        });\r\n\r\n        window.addEventListener(\"pageshow\", (e) => {\r\n            if (e.persisted) {\r\n                sidebar.classList.remove(\"visible\");\r\n                sidebar.classList.add(\"hidden\");\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initFocusedToc() {\r\n    if (document.querySelector(\".ptx-toc.focused\") === null) return;\r\n\r\n    let maxDepth = 1000;\r\n    for (let className of document.querySelector(\".ptx-toc\").classList)\r\n        if (className.length > 5 && className.slice(0, 5) === \"depth\")\r\n            maxDepth = Number(className.slice(5));\r\n\r\n    let preexpandedLevels = 1;\r\n    let tocDataSet = document.querySelector(\".ptx-toc\").dataset;\r\n    if (typeof tocDataSet.preexpandedLevels !== \"undefined\")\r\n        preexpandedLevels = Number(tocDataSet.preexpandedLevels);\r\n\r\n    let tocItems = document.querySelectorAll(\r\n        \".ptx-toc ul.structural > .toc-item\"\r\n    );\r\n    for (const tocItem of tocItems) {\r\n        let hasChildren =\r\n            tocItem.querySelector(\"ul.structural\") !== null;\r\n        let depth = getTOCItemDepth(tocItem);\r\n\r\n        if (hasChildren && depth < maxDepth) {\r\n            let expander = document.createElement(\"button\");\r\n            expander.classList.add(\"toc-expander\");\r\n            expander.classList.add(\"toc-chevron-surround\");\r\n            expander.title = \"toc-expander\";\r\n            expander.innerHTML =\r\n                '<span class=\"icon material-symbols-outlined\" aria-hidden=\"true\"></span>';\r\n            tocItem.querySelector(\".toc-title-box\").append(expander);\r\n            expander.addEventListener(\"click\", () => {\r\n                toggleTOCItem(expander);\r\n            });\r\n\r\n            let isActive =\r\n                tocItem.classList.contains(\"contains-active\") ||\r\n                tocItem.classList.contains(\"active\");\r\n            let preExpanded = isActive || depth < preexpandedLevels;\r\n            let itemType = getTOCItemType(tocItem);\r\n            if (preExpanded) {\r\n                toggleTOCItem(expander);\r\n            } else {\r\n                expander.title =\r\n                    \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n            }\r\n        }\r\n    }\r\n\r\n    // Expand parents of hash-linked TOC item\r\n    if (window.location.hash) {\r\n        let hash = window.location.hash;\r\n        let hashLink = document.querySelector(\r\n            `.ptx-toc a[href$=\"${hash}\"]`\r\n        );\r\n        if (hashLink) {\r\n            let parentTocItem = hashLink.closest(\".toc-item\");\r\n            while (\r\n                parentTocItem &&\r\n                !parentTocItem.classList.contains(\"contains-active\")\r\n            ) {\r\n                parentTocItem.classList.add(\"contains-active\");\r\n                let expander =\r\n                    parentTocItem.querySelector(\".toc-expander\");\r\n                if (expander) {\r\n                    if (!parentTocItem.classList.contains(\"expanded\")) {\r\n                        toggleTOCItem(expander);\r\n                    }\r\n                }\r\n                parentTocItem =\r\n                    parentTocItem.parentElement.closest(\".toc-item\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initScrollToc() {\r\n    scrollTocToActive();\r\n    window.onhashchange = scrollTocToActive;\r\n}\r\n", "/**\r\n * Knowl behavior (from knowl.js).\r\n *\r\n * Manages xref knowls and born-hidden knowls: click-to-reveal with\r\n * slide animation, lazy content fetching, and MathJax re-typesetting.\r\n */\r\n\r\n// Used to animate both types of knowls\r\nclass SlideRevealer {\r\n    static STATE = Object.freeze({\r\n        INACTIVE: 0,\r\n        CLOSING: 1,\r\n        EXPANDING: 2,\r\n    });\r\n\r\n    constructor(triggerElement, contentElement, animatedElement) {\r\n        this.triggerElement = triggerElement;\r\n        this.contentElement = contentElement;\r\n        this.animatedElement = animatedElement;\r\n\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        this.triggerElement.addEventListener(\"click\", (e) => this.onClick(e));\r\n    }\r\n\r\n    onClick(e) {\r\n        if (e) e.preventDefault();\r\n        this.animatedElement.style.overflow = \"hidden\";\r\n\r\n        if (\r\n            this.animationState === SlideRevealer.STATE.CLOSING ||\r\n            !this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.animatedElement.setAttribute(\"open\", \"\");\r\n            this.triggerElement.setAttribute(\"open\", \"\");\r\n            this.contentElement.style.display = \"\";\r\n            MathJax.typesetPromise().then(() =>\r\n                window.requestAnimationFrame(() => this.toggle(true))\r\n            );\r\n        } else if (\r\n            this.animationState === SlideRevealer.STATE.EXPANDING ||\r\n            this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.toggle(false);\r\n        }\r\n    }\r\n\r\n    toggle(expanding) {\r\n        let closedHeight = 0;\r\n        if (this.animatedElement.contains(this.triggerElement))\r\n            closedHeight = this.triggerElement.offsetHeight;\r\n        const fullHeight = closedHeight + this.contentElement.offsetHeight;\r\n\r\n        const startHeight = `${expanding ? closedHeight : fullHeight}px`;\r\n        const endHeight = `${expanding ? fullHeight : closedHeight}px`;\r\n\r\n        const padding =\r\n            this.animatedElement.offsetHeight -\r\n            this.animatedElement.clientHeight;\r\n        const startPad = `${expanding ? 0 : padding}px`;\r\n        const endPad = `${expanding ? padding : 0}px`;\r\n\r\n        if (this.animation) this.animation.cancel();\r\n\r\n        const animDuration = Math.max(\r\n            Math.min(\r\n                (Math.abs(closedHeight - fullHeight) / 400) * 1000,\r\n                750\r\n            ),\r\n            250\r\n        );\r\n\r\n        this.animationState = expanding\r\n            ? SlideRevealer.STATE.EXPANDING\r\n            : SlideRevealer.STATE.CLOSING;\r\n        this.animation = this.animatedElement.animate(\r\n            {\r\n                height: [startHeight, endHeight],\r\n                paddingTop: [startPad, endPad],\r\n                paddingBottom: [startPad, endPad],\r\n            },\r\n            { duration: animDuration, easing: \"ease\" }\r\n        );\r\n\r\n        this.animation.onfinish = () => {\r\n            this.onAnimationFinish(expanding);\r\n        };\r\n        this.animation.oncancel = () => {\r\n            this.animationState = SlideRevealer.STATE.INACTIVE;\r\n        };\r\n    }\r\n\r\n    onAnimationFinish(isOpen) {\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        if (!isOpen) {\r\n            this.animatedElement.removeAttribute(\"open\");\r\n            this.triggerElement.removeAttribute(\"open\");\r\n        }\r\n\r\n        this.animatedElement.style.overflow = \"\";\r\n        if (!isOpen) this.contentElement.style.display = \"none\";\r\n\r\n        if (isOpen) {\r\n            let hasCallback =\r\n                this.contentElement.querySelectorAll(\r\n                    \"[data-knowl-callback]\"\r\n                );\r\n            hasCallback.forEach((el) => {\r\n                window[el.getAttribute(\"data-knowl-callback\")](el, open);\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nclass LinkKnowl {\r\n    static xrefCount = 0;\r\n\r\n    static initializeXrefKnowl(knowlLinkElement) {\r\n        if (\r\n            knowlLinkElement.getAttribute(\"data-knowl-uid\") === null\r\n        ) {\r\n            return new LinkKnowl(knowlLinkElement);\r\n        }\r\n    }\r\n\r\n    constructor(knowlLinkElement) {\r\n        this.linkElement = knowlLinkElement;\r\n        this.outputElement = null;\r\n        this.uid = LinkKnowl.xrefCount++;\r\n        knowlLinkElement.setAttribute(\"data-knowl-uid\", this.uid);\r\n        knowlLinkElement.setAttribute(\"role\", \"button\");\r\n        knowlLinkElement.setAttribute(\r\n            \"data-base-title\",\r\n            knowlLinkElement.getAttribute(\"title\") ||\r\n                this.linkElement.textContent\r\n        );\r\n        knowlLinkElement.classList.add(\"knowl__link\");\r\n        this.updateLabels(false);\r\n        knowlLinkElement.addEventListener(\r\n            \"click\",\r\n            this.handleLinkClick.bind(this)\r\n        );\r\n    }\r\n\r\n    updateLabels(isVisible) {\r\n        const verb = isVisible\r\n            ? this.linkElement.getAttribute(\"data-close-label\") || \"Close\"\r\n            : this.linkElement.getAttribute(\"data-reveal-label\") ||\r\n              \"Reveal\";\r\n        const targetDescript =\r\n            this.linkElement.getAttribute(\"data-base-title\");\r\n        const helpText = verb + \" \" + targetDescript;\r\n        this.linkElement.setAttribute(\"aria-label\", helpText);\r\n        this.linkElement.setAttribute(\"title\", helpText);\r\n    }\r\n\r\n    toggle() {\r\n        this.linkElement.classList.toggle(\"active\");\r\n        const isActive = this.linkElement.classList.contains(\"active\");\r\n        this.updateLabels(isActive);\r\n\r\n        if (isActive) {\r\n            const h = this.outputElement.getBoundingClientRect().height;\r\n            if (h > window.innerHeight) {\r\n                this.outputElement.scrollIntoView(true);\r\n            } else {\r\n                if (\r\n                    this.outputElement.getBoundingClientRect().bottom >\r\n                    window.innerHeight\r\n                )\r\n                    this.outputElement.scrollIntoView(false);\r\n            }\r\n        }\r\n    }\r\n\r\n    findOutputLocation() {\r\n        const invalidParents =\r\n            \"table, mjx-container, div.tabular-box, .runestone > .parsons\";\r\n        let el = this.linkElement.parentElement;\r\n        let problemAncestor = el.closest(invalidParents);\r\n        while (problemAncestor && problemAncestor !== el) {\r\n            el = problemAncestor;\r\n            problemAncestor = el.closest(invalidParents);\r\n        }\r\n        return el;\r\n    }\r\n\r\n    createOutputElement() {\r\n        const outputId = \"knowl-uid-\" + this.uid;\r\n        const outputContentsId = \"knowl-output-\" + this.uid;\r\n        const linkTarget =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n\r\n        const placeholderText =\r\n            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +\r\n            `Loading '${linkTarget}'` +\r\n            `</div>`;\r\n\r\n        const temp = document.createElement(\"template\");\r\n        temp.innerHTML = placeholderText;\r\n        this.outputElement = temp.content.children[0];\r\n\r\n        const insertLoc = this.findOutputLocation(this.linkElement);\r\n        insertLoc.after(this.outputElement);\r\n    }\r\n\r\n    async getContent() {\r\n        const contentURL =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n        const knowlContent = await fetch(contentURL)\r\n            .then((response) => response.text())\r\n            .then((data) => {\r\n                let knowlDoc = new DOMParser().parseFromString(\r\n                    data,\r\n                    \"text/html\"\r\n                );\r\n                let tempContainer = knowlDoc.body;\r\n                let scripts = knowlDoc.querySelectorAll(\"head script\");\r\n                tempContainer.append(...scripts);\r\n                return tempContainer;\r\n            })\r\n            .catch((error) => {\r\n                const destination =\r\n                    this.linkElement.getAttribute(\"href\");\r\n                const text = this.linkElement.textContent;\r\n                const err_message =\r\n                    `<div class='knowl-output__error'>` +\r\n                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +\r\n                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +\r\n                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href=\"https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally\">PreTeXt FAQ</a> for more information.</div>` +\r\n                    `</div>`;\r\n                return err_message;\r\n            });\r\n        return knowlContent;\r\n    }\r\n\r\n    handleLinkClick(event) {\r\n        event.preventDefault();\r\n\r\n        if (this.outputElement !== null) {\r\n            this.toggle();\r\n        } else {\r\n            this.createOutputElement();\r\n\r\n            const slideHandler = new SlideRevealer(\r\n                this.linkElement,\r\n                this.outputElement,\r\n                this.outputElement\r\n            );\r\n            this.linkElement.addEventListener(\"click\", slideHandler);\r\n\r\n            let loadingTimeout = setTimeout(() => {\r\n                loadingTimeout = null;\r\n                slideHandler.onClick();\r\n                this.toggle();\r\n            }, 500);\r\n\r\n            const content = this.getContent();\r\n\r\n            content\r\n                .then((tempContainer) => {\r\n                    if (loadingTimeout !== null) {\r\n                        clearTimeout(loadingTimeout);\r\n                    }\r\n                    setTimeout(() => {\r\n                        slideHandler.onClick();\r\n                        this.toggle();\r\n                    }, 100);\r\n\r\n                    const runestoneElements =\r\n                        tempContainer.querySelectorAll(\r\n                            \".ptx-runestone-container\"\r\n                        );\r\n                    [...runestoneElements].forEach((e) => {\r\n                        const rsId =\r\n                            e.querySelector(\"[data-component]\")?.id;\r\n                        const onPage = document.getElementById(rsId);\r\n                        if (onPage) {\r\n                            e.innerHTML = `<div class=\"para\">The interactive that belongs here is already on the page and cannot appear multiple times. <a href=\"#${rsId}\">Scroll to interactive.</a>`;\r\n                        } else {\r\n                            window.runestoneComponents.renderOneComponent(\r\n                                e\r\n                            );\r\n                        }\r\n                    });\r\n\r\n                    const children = [...tempContainer.children];\r\n                    this.outputElement.innerHTML = \"\";\r\n                    this.outputElement.append(...children);\r\n\r\n                    addKnowls(this.outputElement);\r\n                    Prism.highlightAllUnder(this.outputElement);\r\n\r\n                    [\r\n                        ...this.outputElement.getElementsByTagName(\r\n                            \"script\"\r\n                        ),\r\n                    ].forEach((s) => {\r\n                        if (\r\n                            s.getAttribute(\"type\") === null ||\r\n                            s.getAttribute(\"type\") ===\r\n                                \"text/javascript\"\r\n                        ) {\r\n                            eval(s.innerHTML);\r\n                        }\r\n                    });\r\n                })\r\n                .catch((data) => {\r\n                    console.log(\r\n                        \"Error fetching knowl content: \" + data\r\n                    );\r\n                });\r\n        }\r\n    }\r\n}\r\n\r\nexport function addKnowls(target) {\r\n    const xrefs = target.querySelectorAll(\"[data-knowl]\");\r\n    for (const xref of xrefs) {\r\n        LinkKnowl.initializeXrefKnowl(xref);\r\n    }\r\n\r\n    const bornHiddens = target.querySelectorAll(\".born-hidden-knowl\");\r\n    for (const bhk of bornHiddens) {\r\n        const summary = bhk.querySelector(\":scope > summary\");\r\n        const contents = bhk.querySelector(\":scope > summary + *\");\r\n        new SlideRevealer(summary, contents, bhk);\r\n    }\r\n}\r\n\r\nexport function initKnowls() {\r\n    addKnowls(document);\r\n}\r\n", "/**\r\n * LTI iframe resizer (from lti_iframe_resizer.js).\r\n *\r\n * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),\r\n * adjusting iframe dimensions based on postMessage events.\r\n *\r\n * @see https://cssplice.org/\r\n */\r\n\r\nexport function sendResizeRequest(el) {\r\n    el.contentWindow.postMessage(\"requestResize\", \"*\");\r\n}\r\n\r\nexport function initLtiIframeResizer() {\r\n    window.addEventListener(\"message\", function (event) {\r\n        let edata = event.data;\r\n\r\n        // MoM sends event.data as a string instead of JSON\r\n        if (\r\n            typeof event.data == \"string\" &&\r\n            event.data.match(/lti\\.frameResize/)\r\n        ) {\r\n            edata = JSON.parse(event.data);\r\n        }\r\n\r\n        if (edata.subject === \"lti.frameResize\") {\r\n            if (\"frame_id\" in edata) {\r\n                const el = document.getElementById(edata[\"frame_id\"]);\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n                if (\r\n                    edata.wrapheight &&\r\n                    document.getElementById(edata[\"frame_id\"] + \"wrap\")\r\n                ) {\r\n                    document.getElementById(\r\n                        edata[\"frame_id\"] + \"wrap\"\r\n                    ).style.height = edata.wrapheight + \"px\";\r\n                }\r\n            } else if (\"iframe_resize_id\" in edata) {\r\n                const el = document.getElementById(\r\n                    edata[\"iframe_resize_id\"]\r\n                );\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n            } else {\r\n                const iFrames =\r\n                    document.getElementsByTagName(\"iframe\");\r\n                for (const iFrame of iFrames) {\r\n                    if (iFrame.contentWindow === event.source) {\r\n                        if (edata.height) {\r\n                            iFrame.height = edata.height;\r\n                            iFrame.style.height = edata.height + \"px\";\r\n                        }\r\n                        if (edata.width) {\r\n                            iFrame.width = edata.width;\r\n                            iFrame.style.width = edata.width + \"px\";\r\n                        }\r\n                        break;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Permalink copy-to-clipboard functionality.\r\n *\r\n * Copies permalink URLs to the clipboard using the Clipboard API,\r\n * with a brief visual confirmation message.\r\n */\r\n\r\nasync function copyPermalink(linkNode) {\r\n    if (!navigator.clipboard) {\r\n        console.log(\"Error: Clipboard API not available\");\r\n        return;\r\n    }\r\n    const elem = linkNode.parentElement;\r\n    if (!linkNode) {\r\n        console.log(\"Error: Something went wrong finding permalink URL\");\r\n        return;\r\n    }\r\n    const url = linkNode.href;\r\n    const description = elem.getAttribute(\"data-description\");\r\n    const link = `<a href=\"${url}\">${description}</a>`;\r\n    const msgLink = `<a class=\"internal\" href=\"${url}\">${description}</a>`;\r\n    const textFallback = description + \" \\r\\n\" + url;\r\n    let copySuccess = true;\r\n\r\n    try {\r\n        // NOTE: this method will only work in Firefox if the user has\r\n        //    dom.events.asyncClipboard.clipboardItem\r\n        // set to true in their about:config.\r\n        await navigator.clipboard.write([\r\n            new ClipboardItem({\r\n                \"text/html\": new Blob([link], { type: \"text/html\" }),\r\n                \"text/plain\": new Blob([textFallback], { type: \"text/plain\" }),\r\n            }),\r\n        ]);\r\n    } catch (err) {\r\n        console.log(\r\n            \"Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText\",\r\n            err\r\n        );\r\n        copySuccess = false;\r\n    }\r\n\r\n    if (!copySuccess) {\r\n        try {\r\n            await navigator.clipboard.writeText(textFallback);\r\n        } catch (err) {\r\n            console.log(\r\n                \"Permalink-to-clipboard using clipboard.writeText failed\",\r\n                err\r\n            );\r\n            console.error(\"Failed to copy link to clipboard!\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    console.log(`copied '${url}' to clipboard`);\r\n    const copiedMsg = document.createElement(\"p\");\r\n    copiedMsg.setAttribute(\"role\", \"alert\");\r\n    copiedMsg.className = \"permalink-alert\";\r\n    copiedMsg.innerHTML = \"Link to \" + msgLink + \" copied to clipboard\";\r\n    elem.parentElement.insertBefore(copiedMsg, elem);\r\n    await new Promise((resolve) => setTimeout(resolve, 1500));\r\n    copiedMsg.remove();\r\n}\r\n\r\nexport function initPermalinks() {\r\n    const permalinks = document.querySelectorAll(\".autopermalink > a\");\r\n    permalinks.forEach((link) => {\r\n        link.addEventListener(\"click\", function (event) {\r\n            event.preventDefault();\r\n            copyPermalink(link);\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Image magnification (click-to-zoom).\r\n *\r\n * Clicking an eligible image creates a full-width popup; clicking the\r\n * popup dismisses it.  Uses event delegation on the document body.\r\n */\r\n\r\n/**\r\n * Walk up from `el` through ancestors, collecting those that match `selector`.\r\n * Returns the *last* (outermost) match \u2014 equivalent to jQuery's\r\n * `.parents(selector).last()`.\r\n */\r\nfunction outermostMatchingAncestor(el, selector) {\r\n    let match = null;\r\n    let current = el.parentElement;\r\n    while (current) {\r\n        if (current.matches(selector)) {\r\n            match = current;\r\n        }\r\n        current = current.parentElement;\r\n    }\r\n    return match;\r\n}\r\n\r\nexport function initImageMagnify() {\r\n    const imgSelector =\r\n        \".image-box > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \".sbspanel > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > div > img:not(.draw_on_me):not(.mag_popup)\";\r\n\r\n    // Click an image to magnify\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const img = event.target.closest(imgSelector);\r\n        if (!img) return;\r\n\r\n        const container = document.createElement(\"div\");\r\n        container.setAttribute(\"style\", \"background:#fff;\");\r\n        container.setAttribute(\"class\", \"mag_popup_container\");\r\n        container.innerHTML =\r\n            '<img src=\"' +\r\n            img.src +\r\n            '\" style=\"width:100%\" class=\"mag_popup\"/>';\r\n\r\n        let placement = outermostMatchingAncestor(\r\n            img,\r\n            \".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)\"\r\n        );\r\n\r\n        // For .cols2, even articles go inside the previous odd one\r\n        if (placement && placement.tagName === \"ARTICLE\") {\r\n            const prev = placement.previousElementSibling;\r\n            if (prev) {\r\n                placement = prev.firstElementChild || prev;\r\n            }\r\n        }\r\n\r\n        if (placement) {\r\n            placement.parentNode.insertBefore(container, placement);\r\n        }\r\n    });\r\n\r\n    // Click the big image to dismiss it\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        if (event.target.classList.contains(\"mag_popup\")) {\r\n            event.target.parentNode.remove();\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Scrollbar width detection utility.\r\n *\r\n * \u26A0\uFE0F DEPRECATED: Only used by the GeoGebra calculator integration.\r\n * Consider replacing with a CSS-based approach in the future.\r\n *\r\n * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript\r\n */\r\n\r\nexport function getScrollbarWidth() {\r\n    const outer = document.createElement(\"div\");\r\n    outer.style.visibility = \"hidden\";\r\n    outer.style.width = \"100px\";\r\n    outer.style.msOverflowStyle = \"scrollbar\"; // needed for WinJS apps\r\n\r\n    document.body.appendChild(outer);\r\n\r\n    const widthNoScroll = outer.offsetWidth;\r\n    outer.style.overflow = \"scroll\";\r\n\r\n    const inner = document.createElement(\"div\");\r\n    inner.style.width = \"100%\";\r\n    outer.appendChild(inner);\r\n\r\n    const widthWithScroll = inner.offsetWidth;\r\n    outer.parentNode.removeChild(outer);\r\n\r\n    return widthNoScroll - widthWithScroll;\r\n}\r\n", "/**\r\n * GeoGebra calculator integration.\r\n *\r\n * Manages the floating GeoGebra calculator overlay: toggling visibility,\r\n * preventing body scroll while hovering the canvas, and injecting the\r\n * GeoGebra applet script on first open.\r\n */\r\n\r\nimport { getScrollbarWidth } from \"./deprecated/scrollbar-width.js\";\r\n\r\nfunction calculatorOnload() {\r\n    const toggle = document.getElementById(\"calculator-toggle\");\r\n    if (toggle) toggle.focus();\r\n    const inputField = document.querySelector(\r\n        \"input.gwt-SuggestBox.TextField\"\r\n    );\r\n    if (inputField) inputField.focus();\r\n}\r\n\r\nexport function initGeoGebra() {\r\n    const scrollWidth = getScrollbarWidth();\r\n    const calcOffsetR = 5;\r\n    const calcOffsetB = 5;\r\n\r\n    // Prevent body scroll when hovering the GeoGebra canvas\r\n    document.body.addEventListener(\"mouseover\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"hidden\";\r\n        document.documentElement.style.marginRight = \"15px\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + scrollWidth + \"px\";\r\n            container.style.bottom = calcOffsetB + scrollWidth + \"px\";\r\n        }\r\n    });\r\n\r\n    document.body.addEventListener(\"mouseout\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"scroll\";\r\n        document.documentElement.style.marginRight = \"0\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + \"px\";\r\n            container.style.bottom = calcOffsetB + \"px\";\r\n        }\r\n    });\r\n\r\n    // Toggle calculator visibility\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const toggle = event.target.closest(\"#calculator-toggle\");\r\n        if (!toggle) return;\r\n\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (!container) return;\r\n\r\n        if (container.style.display === \"none\" || !container.style.display) {\r\n            container.style.display = \"block\";\r\n            toggle.classList.add(\"open\");\r\n            toggle.setAttribute(\"title\", \"Hide calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"true\");\r\n\r\n            const existingScript = document.getElementById(\"create_ggb_calc\");\r\n            if (!existingScript) {\r\n                const ggbScript = document.createElement(\"script\");\r\n                ggbScript.id = \"create_ggb_calc\";\r\n                ggbScript.innerHTML = \"ggbApp.inject('geogebra-calculator')\";\r\n                document.body.appendChild(ggbScript);\r\n            } else {\r\n                calculatorOnload();\r\n            }\r\n        } else {\r\n            container.style.display = \"none\";\r\n            toggle.classList.remove(\"open\");\r\n            toggle.setAttribute(\"title\", \"Show calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"false\");\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Keyboard navigation handlers.\r\n *\r\n * - ENTER in a `.workspace` triggers MathJax typesetting.\r\n * - ESC navigates back through Sage cell focus, then up the knowl stack,\r\n *   or does nothing if no interactive context is active.\r\n * - Hash-based anchor navigation: opens knowls linked via URL hash.\r\n */\r\n\r\nlet justHitEscape = false;\r\n\r\nfunction processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n\r\nexport function initKeyboardNav() {\r\n    document.onkeyup = function (event) {\r\n        const e = event || window.event;\r\n        switch (e.keyCode) {\r\n            case 13: // ENTER\r\n                justHitEscape = false;\r\n                if (\r\n                    document.activeElement.classList.contains(\"workspace\")\r\n                ) {\r\n                    processWorkspace();\r\n                }\r\n                break; // Fixed: was missing, caused fallthrough to ESC handler\r\n\r\n            case 27: // ESC\r\n            {\r\n                const parentSageCell =\r\n                    document.activeElement.closest(\".sagecell_editor\");\r\n                if (parentSageCell && !justHitEscape) {\r\n                    justHitEscape = true;\r\n                    setTimeout(function () {\r\n                        justHitEscape = false;\r\n                    }, 1000);\r\n                }\r\n                // knowl_focus_stack is defined in knowl.js and may not exist\r\n                // in all contexts \u2014 guard against ReferenceError\r\n                else if (\r\n                    typeof knowl_focus_stack !== \"undefined\" &&\r\n                    knowl_focus_stack.length > 0\r\n                ) {\r\n                    const mostRecentlyOpened = knowl_focus_stack.pop();\r\n                    if (typeof knowl_focus_stack_uid !== \"undefined\") {\r\n                        knowl_focus_stack_uid.pop();\r\n                    }\r\n                    mostRecentlyOpened.focus();\r\n                } else {\r\n                    break;\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    };\r\n}\r\n\r\nexport function initAnchorKnowl() {\r\n    if (!window.location.hash.length) return;\r\n\r\n    const id = window.location.hash.substring(1);\r\n    const anchor = document.getElementById(id);\r\n    if (!anchor) return;\r\n\r\n    if (anchor.tagName === \"ARTICLE\") {\r\n        const containedKnowl = anchor.querySelector(\"a[data-knowl]\");\r\n        if (containedKnowl && containedKnowl.parentElement === anchor) {\r\n            containedKnowl.click();\r\n        }\r\n    } else if (anchor.hasAttribute(\"data-knowl\")) {\r\n        anchor.click();\r\n    } else {\r\n        // If it is a hidden knowl, find the knowl and open it\r\n        const hiddenContent = anchor.closest(\".hidden-content\");\r\n        if (hiddenContent) {\r\n            const refId = hiddenContent.id;\r\n            const knowl = document.querySelector(\r\n                '[data-refid=\"' + refId + '\"]'\r\n            );\r\n            if (knowl) knowl.click();\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview page geometry helpers.\r\n *\r\n * Utilities for converting CSS units to pixels, computing element heights,\r\n * and injecting dynamic @page / CSS-variable rules.\r\n */\r\n\r\nexport function toPixels(value) {\r\n    if (typeof value === \"number\") return value;\r\n    if (typeof value !== \"string\") return 0;\r\n    value = value.trim();\r\n    if (value.endsWith(\"px\")) {\r\n        return parseFloat(value);\r\n    } else if (value.endsWith(\"in\")) {\r\n        return Math.floor(parseFloat(value) * 96);\r\n    } else if (value.endsWith(\"cm\")) {\r\n        return Math.floor(parseFloat(value) * 37.8);\r\n    } else if (value.endsWith(\"mm\")) {\r\n        return Math.floor(parseFloat(value) * 3.78);\r\n    } else if (value.endsWith(\"pt\")) {\r\n        return Math.floor(parseFloat(value) * (96 / 72));\r\n    } else {\r\n        return parseFloat(value) || 0;\r\n    }\r\n}\r\n\r\nexport function getElementTotalHeight(elem) {\r\n    const style = getComputedStyle(elem);\r\n    const marginTop = parseFloat(style.marginTop);\r\n    const marginBottom = parseFloat(style.marginBottom);\r\n    const height = elem.offsetHeight;\r\n    return height + marginTop + marginBottom;\r\n}\r\n\r\nexport function getElemWorkspaceHeight(elem) {\r\n    if (elem.classList.contains(\"sidebyside\")) {\r\n        const sbspanels = elem.querySelectorAll(\".sbspanel\");\r\n        let max = 0;\r\n        sbspanels.forEach((panel) => {\r\n            const workspaces = panel.querySelectorAll(\".workspace\");\r\n            let totalHeight = 0;\r\n            workspaces.forEach((workspace) => {\r\n                const workspaceHeight = workspace.offsetHeight;\r\n                if (workspaceHeight) {\r\n                    totalHeight += workspaceHeight;\r\n                }\r\n            });\r\n            if (totalHeight > max) {\r\n                max = totalHeight;\r\n            }\r\n        });\r\n        return max;\r\n    }\r\n\r\n    let columns = 1;\r\n    if (elem.classList.contains(\"exercisegroup\")) {\r\n        for (let i = 2; i <= 6; i++) {\r\n            if (elem.querySelector(`.cols${i}`)) {\r\n                columns = i;\r\n                break;\r\n            }\r\n        }\r\n    }\r\n    const workspaces = elem.querySelectorAll(\".workspace\");\r\n    let totalHeight = 0;\r\n    workspaces.forEach((ws) => {\r\n        const workspaceHeight = ws.offsetHeight;\r\n        if (workspaceHeight) {\r\n            totalHeight += workspaceHeight;\r\n        }\r\n    });\r\n    return totalHeight / columns;\r\n}\r\n\r\nexport function setPageGeometryCSS({ paperSize, margins }) {\r\n    const existingStyle = document.getElementById(\"page-geometry-css\");\r\n    if (existingStyle) {\r\n        existingStyle.remove();\r\n    }\r\n    const wsWidth = paperSize === \"letter\" ? \"816px\" : \"794px\";\r\n    const wsHeight = paperSize === \"letter\" ? \"1056px\" : \"1123px\";\r\n\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"page-geometry-css\";\r\n    style.textContent = `\r\n        :root {\r\n            --ws-width: ${wsWidth};\r\n            --ws-height: ${wsHeight};\r\n            --ws-top-margin: ${margins.top}px;\r\n            --ws-right-margin: ${margins.right}px;\r\n            --ws-bottom-margin: ${margins.bottom}px;\r\n            --ws-left-margin: ${margins.left}px;\r\n        }\r\n        @page {\r\n            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);\r\n        }\r\n    `;\r\n    document.head.appendChild(style);\r\n}\r\n", "/**\r\n * Print-preview workspace height management.\r\n *\r\n * Handles setting initial workspace heights from data attributes,\r\n * adjusting heights to fit pages, highlighting workspace areas,\r\n * and MathJax re-typesetting on workspace edits.\r\n */\r\n\r\nimport { getElementTotalHeight, getElemWorkspaceHeight } from \"./geometry.js\";\r\n\r\nexport function setInitialWorkspaceHeights() {\r\n    const workspaces = document.querySelectorAll(\".workspace\");\r\n    workspaces.forEach((ws) => {\r\n        ws.style.height = ws.getAttribute(\"data-space\") || \"0px\";\r\n        ws.setAttribute(\"contenteditable\", \"true\");\r\n    });\r\n}\r\n\r\nexport function adjustWorkspaceToFitPage({ paperSize, margins }) {\r\n    // Toggle off workspace highlight if it is on\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(false);\r\n    }\r\n\r\n    let paperWidth, paperHeight;\r\n    if (paperSize === \"a4\" || document.body.classList.contains(\"a4\")) {\r\n        paperWidth = 794;\r\n        paperHeight = 1122.5;\r\n    } else {\r\n        paperWidth = 816;\r\n        paperHeight = 1056;\r\n    }\r\n    const paperContentHeight = paperHeight - (margins.top + margins.bottom);\r\n\r\n    setInitialWorkspaceHeights();\r\n\r\n    const pages = document.querySelectorAll(\".onepage\");\r\n    pages.forEach((page) => {\r\n        page.style.width = paperWidth + \"px\";\r\n        const rows = page.children;\r\n        let totalContentHeight = 0;\r\n        let totalWorkspaceHeight = 0;\r\n        for (const row of rows) {\r\n            totalContentHeight += getElementTotalHeight(row);\r\n            totalWorkspaceHeight += getElemWorkspaceHeight(row);\r\n        }\r\n        if (totalWorkspaceHeight === 0) {\r\n            page.style.width = \"\";\r\n            return;\r\n        }\r\n        const extraHeight = paperContentHeight - totalContentHeight;\r\n        const workspaceAdjustmentFactor =\r\n            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;\r\n        const pageWorkspaces = page.querySelectorAll(\".workspace\");\r\n        pageWorkspaces.forEach((ws) => {\r\n            const originalHeight = ws.offsetHeight;\r\n            const newHeight = originalHeight * workspaceAdjustmentFactor;\r\n            ws.style.height = newHeight + \"px\";\r\n        });\r\n        page.style.width = \"\";\r\n    });\r\n\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(true);\r\n    }\r\n}\r\n\r\nexport function toggleWorkspaceHighlight(isChecked) {\r\n    if (isChecked) {\r\n        document.body.classList.add(\"highlight-workspace\");\r\n        if (!document.querySelector(\".workspace-container\")) {\r\n            document.querySelectorAll(\".workspace\").forEach((workspace) => {\r\n                const container = document.createElement(\"div\");\r\n                container.classList.add(\"workspace-container\");\r\n                container.style.height =\r\n                    window.getComputedStyle(workspace).height;\r\n                const original = document.createElement(\"div\");\r\n                original.classList.add(\"original-workspace\");\r\n                const originalHeight =\r\n                    workspace.getAttribute(\"data-space\") || \"0px\";\r\n                original.setAttribute(\r\n                    \"title\",\r\n                    \"Author-specified workspace height (\" +\r\n                        originalHeight +\r\n                        \")\"\r\n                );\r\n                original.style.height = originalHeight;\r\n                container.appendChild(original);\r\n                if (original.offsetHeight > workspace.offsetHeight) {\r\n                    original.classList.add(\"warning\");\r\n                }\r\n                workspace.parentNode.insertBefore(container, workspace);\r\n                container.appendChild(workspace);\r\n            });\r\n        }\r\n    } else {\r\n        document.body.classList.remove(\"highlight-workspace\");\r\n        document\r\n            .querySelectorAll(\".workspace-container\")\r\n            .forEach((container) => {\r\n                const workspace = container.querySelector(\".workspace\");\r\n                container.parentNode.insertBefore(workspace, container);\r\n                container.remove();\r\n            });\r\n    }\r\n}\r\n\r\nexport function processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n", "/**\r\n * Dynamic-programming page-break algorithm.\r\n *\r\n * Given a list of content blocks with heights and workspace heights,\r\n * finds page-break positions that minimize leftover whitespace variance\r\n * across pages.\r\n */\r\n\r\nexport function findPageBreaks(rows, pageHeight) {\r\n    let pageBreaks = [];\r\n    let minCost = Array(rows.length + 1).fill(Infinity);\r\n    minCost[rows.length] = 0;\r\n    let nextPageBreak = Array(rows.length).fill(-1);\r\n\r\n    for (let i = rows.length - 1; i >= 0; i--) {\r\n        let cumulativeHeight = 0;\r\n        for (let j = i; j < rows.length; j++) {\r\n            cumulativeHeight += rows[j].height;\r\n            if (cumulativeHeight > pageHeight) {\r\n                if (j === i) {\r\n                    // Single row exceeds page height \u2014 give it its own page\r\n                    minCost[i] = 0;\r\n                    nextPageBreak[i] = i + 1;\r\n                }\r\n                break;\r\n            }\r\n\r\n            const cost =\r\n                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];\r\n            if (cost < minCost[i]) {\r\n                minCost[i] = cost;\r\n                nextPageBreak[i] = j + 1;\r\n            }\r\n        }\r\n    }\r\n\r\n    // Backtrack: row 0 is always a title sharing the first page with row 1\r\n    let nextPage = 1;\r\n    while (nextPage < rows.length) {\r\n        pageBreaks.push(nextPageBreak[nextPage]);\r\n        nextPage = nextPageBreak[nextPage];\r\n    }\r\n    return pageBreaks;\r\n}\r\n", "/**\r\n * Print-preview page creation and adjustment.\r\n *\r\n * Handles flattening paragraph sections, waiting for images,\r\n * adjusting pre-existing pages, and algorithmically creating\r\n * new page divisions for printout content.\r\n */\r\n\r\nimport {\r\n    getElementTotalHeight,\r\n    getElemWorkspaceHeight,\r\n} from \"./geometry.js\";\r\nimport { setInitialWorkspaceHeights } from \"./workspace.js\";\r\nimport { findPageBreaks } from \"./page-breaks.js\";\r\n\r\nexport function flattenParagraphsSections(printout) {\r\n    const paragraphsSections = printout.querySelectorAll(\r\n        \"section.paragraphs\"\r\n    );\r\n    paragraphsSections.forEach((section) => {\r\n        const parent = section.parentNode;\r\n        while (section.firstChild) {\r\n            parent.insertBefore(section.firstChild, section);\r\n        }\r\n        parent.removeChild(section);\r\n    });\r\n}\r\n\r\nexport function waitForImages(container, timeoutMs = 5000) {\r\n    const images = container.querySelectorAll(\"img\");\r\n    const promises = [];\r\n    for (const img of images) {\r\n        if (!img.complete) {\r\n            promises.push(\r\n                new Promise((resolve) => {\r\n                    img.addEventListener(\"load\", resolve, { once: true });\r\n                    img.addEventListener(\"error\", resolve, { once: true });\r\n                })\r\n            );\r\n        }\r\n    }\r\n    if (promises.length === 0) return Promise.resolve();\r\n    return Promise.race([\r\n        Promise.all(promises),\r\n        new Promise((resolve) => setTimeout(resolve, timeoutMs)),\r\n    ]);\r\n}\r\n\r\nexport function adjustPrintoutPages() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    if (pages.length === 0) return;\r\n\r\n    const firstPage = pages[0];\r\n    const lastPage = pages[pages.length - 1];\r\n\r\n    // Move all children before the first page into the first page\r\n    const pageFirstChild = firstPage.firstChild;\r\n    let currentChild = printout.firstChild;\r\n    while (currentChild && currentChild !== firstPage) {\r\n        const nextChild = currentChild.nextSibling;\r\n        firstPage.insertBefore(currentChild, pageFirstChild);\r\n        currentChild = nextChild;\r\n    }\r\n\r\n    // Move all children after the last page into the last page\r\n    let nextChild = lastPage.nextSibling;\r\n    while (nextChild) {\r\n        const tempChild = nextChild;\r\n        nextChild = nextChild.nextSibling;\r\n        lastPage.appendChild(tempChild);\r\n    }\r\n}\r\n\r\nexport function createPrintoutPages(margins) {\r\n    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);\r\n    const conservativeContentWidth = 794 - (margins.left + margins.right);\r\n\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    printout.style.width =\r\n        (conservativeContentWidth + margins.left + margins.right).toString() +\r\n        \"px\";\r\n    setInitialWorkspaceHeights(printout);\r\n\r\n    // Build list of blocks, handling sidebyside and tasks\r\n    let rows = [];\r\n    for (const child of printout.children) {\r\n        if (child.classList.contains(\"sidebyside\")) {\r\n            rows.push(child);\r\n        } else if (child.querySelector(\".task\")) {\r\n            rows.push(child);\r\n            const tasks = child.querySelectorAll(\".task, .conclusion\");\r\n\r\n            for (let i = 0; i < tasks.length; i++) {\r\n                let parent = tasks[i].parentElement;\r\n                let grandparent = parent.parentElement;\r\n                if (grandparent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subsubtask\");\r\n                } else if (parent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subtask\");\r\n                }\r\n            }\r\n            for (let i = tasks.length - 1; i > 0; i--) {\r\n                printout.insertBefore(tasks[i], child.nextSibling);\r\n            }\r\n        } else {\r\n            rows.push(child);\r\n        }\r\n    }\r\n\r\n    // Build block list with height info\r\n    let blockList = [];\r\n    for (const row of rows) {\r\n        let blockHeight = getElementTotalHeight(row);\r\n        if (blockHeight === 0) continue;\r\n\r\n        let totalWorkspaceHeight = 0;\r\n        if (row.querySelector(\".workspace\")) {\r\n            totalWorkspaceHeight = getElemWorkspaceHeight(row);\r\n        }\r\n        blockList.push({\r\n            elem: row,\r\n            height: blockHeight,\r\n            workspaceHeight: totalWorkspaceHeight,\r\n        });\r\n    }\r\n\r\n    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);\r\n\r\n    // Create page divs\r\n    for (let i = 0; i < pageBreaks.length; i++) {\r\n        const pageDiv = document.createElement(\"section\");\r\n        pageDiv.classList.add(\"onepage\");\r\n        if (i === 0) pageDiv.classList.add(\"firstpage\");\r\n        if (i === pageBreaks.length - 1) pageDiv.classList.add(\"lastpage\");\r\n\r\n        const start = pageBreaks[i - 1] || 0;\r\n        const end = pageBreaks[i];\r\n        for (let j = start; j < end; j++) {\r\n            pageDiv.appendChild(blockList[j].elem);\r\n        }\r\n        printout.appendChild(pageDiv);\r\n    }\r\n\r\n    // Remove content not in a page\r\n    for (const child of Array.from(printout.children)) {\r\n        if (!child.classList.contains(\"onepage\")) {\r\n            printout.removeChild(child);\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview header and footer management.\r\n *\r\n * Adds editable header/footer divs to each page, populates them from\r\n * localStorage or data attributes, and persists edits back to localStorage.\r\n */\r\n\r\nexport function addHeadersAndFootersToPrintout() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    pages.forEach((page, index) => {\r\n        const isFirstPage = index === 0;\r\n\r\n        const headerDiv = document.createElement(\"div\");\r\n        headerDiv.classList.add(\r\n            isFirstPage ? \"first-page-header\" : \"running-header\",\r\n            \"hidden\"\r\n        );\r\n        headerDiv.innerHTML = `<div class=\"header-left\" contenteditable=\"true\"></div><div class=\"header-center\" contenteditable=\"true\"></div><div class=\"header-right\" contenteditable=\"true\"></div>`;\r\n        page.insertBefore(headerDiv, page.firstChild);\r\n\r\n        const footerDiv = document.createElement(\"div\");\r\n        footerDiv.classList.add(\r\n            isFirstPage ? \"first-page-footer\" : \"running-footer\",\r\n            \"hidden\"\r\n        );\r\n        footerDiv.innerHTML = `<div class=\"footer-left\" contenteditable=\"true\"></div><div class=\"footer-center\" contenteditable=\"true\"></div><div class=\"footer-right\" contenteditable=\"true\"></div>`;\r\n        page.appendChild(footerDiv);\r\n    });\r\n\r\n    // Populate from localStorage or data attributes\r\n    const keys = [\r\n        \"header-first-left\",\r\n        \"header-first-center\",\r\n        \"header-first-right\",\r\n        \"footer-first-left\",\r\n        \"footer-first-center\",\r\n        \"footer-first-right\",\r\n        \"header-running-left\",\r\n        \"header-running-center\",\r\n        \"header-running-right\",\r\n        \"footer-running-left\",\r\n        \"footer-running-center\",\r\n        \"footer-running-right\",\r\n    ];\r\n\r\n    const content = {};\r\n    keys.forEach((key) => {\r\n        content[key] =\r\n            localStorage.getItem(key) ||\r\n            printout.getAttribute(`data-${key}`) ||\r\n            \"\";\r\n    });\r\n\r\n    // First page\r\n    const firstHeader = document.querySelector(\".first-page-header\");\r\n    if (firstHeader) {\r\n        firstHeader.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-first-left\"];\r\n        firstHeader.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-first-center\"];\r\n        firstHeader.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-first-right\"];\r\n    }\r\n    const firstFooter = document.querySelector(\".first-page-footer\");\r\n    if (firstFooter) {\r\n        firstFooter.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-first-left\"];\r\n        firstFooter.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-first-center\"];\r\n        firstFooter.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-first-right\"];\r\n    }\r\n\r\n    // Running headers and footers\r\n    document.querySelectorAll(\".running-header\").forEach((headerDiv) => {\r\n        headerDiv.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-running-left\"];\r\n        headerDiv.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-running-center\"];\r\n        headerDiv.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-running-right\"];\r\n    });\r\n    document.querySelectorAll(\".running-footer\").forEach((footerDiv) => {\r\n        footerDiv.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-running-left\"];\r\n        footerDiv.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-running-center\"];\r\n        footerDiv.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-running-right\"];\r\n    });\r\n\r\n    // Persist edits to localStorage\r\n    const selectorMap = {\r\n        \"header-first-left\": \".first-page-header .header-left\",\r\n        \"header-first-center\": \".first-page-header .header-center\",\r\n        \"header-first-right\": \".first-page-header .header-right\",\r\n        \"footer-first-left\": \".first-page-footer .footer-left\",\r\n        \"footer-first-center\": \".first-page-footer .footer-center\",\r\n        \"footer-first-right\": \".first-page-footer .footer-right\",\r\n        \"header-running-left\": \".running-header .header-left\",\r\n        \"header-running-center\": \".running-header .header-center\",\r\n        \"header-running-right\": \".running-header .header-right\",\r\n        \"footer-running-left\": \".running-footer .footer-left\",\r\n        \"footer-running-center\": \".running-footer .footer-center\",\r\n        \"footer-running-right\": \".running-footer .footer-right\",\r\n    };\r\n    keys.forEach((key) => {\r\n        const elements = document.querySelectorAll(selectorMap[key]);\r\n        elements.forEach((elem) => {\r\n            elem.addEventListener(\"input\", () => {\r\n                localStorage.setItem(key, elem.innerHTML);\r\n            });\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Paper size detection.\r\n *\r\n * Determines paper size (letter vs a4) from localStorage, or falls back\r\n * to geographic detection via ipapi.co.\r\n */\r\n\r\nexport function getPaperSize() {\r\n    let paperSize = localStorage.getItem(\"papersize\");\r\n    if (paperSize) return paperSize;\r\n\r\n    // Try to set papersize based on user's geographic region\r\n    try {\r\n        fetch(\"https://ipapi.co/json/\")\r\n            .then((response) => response.json())\r\n            .then((data) => {\r\n                const continent =\r\n                    data && data.continent_code ? data.continent_code : \"\";\r\n                paperSize =\r\n                    continent === \"NA\" || continent === \"SA\"\r\n                        ? \"letter\"\r\n                        : \"a4\";\r\n                const radio = document.querySelector(\r\n                    `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n                );\r\n                if (radio) {\r\n                    radio.checked = true;\r\n                    localStorage.setItem(\"papersize\", paperSize);\r\n                }\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(paperSize);\r\n            })\r\n            .catch((err) => {\r\n                throw err;\r\n            });\r\n    } catch (e) {\r\n        const radio = document.querySelector(\r\n            'input[name=\"papersize\"][value=\"letter\"]'\r\n        );\r\n        if (radio) radio.checked = true;\r\n    }\r\n    return paperSize || \"letter\";\r\n}\r\n", "/**\r\n * Printout section loading (print preview).\r\n *\r\n * Swaps the current page content with the target printable section\r\n * and switches to the print-worksheet stylesheet.\r\n */\r\n\r\nexport async function loadPrintout(printableSectionID) {\r\n    const themeStylesheetLink = document.querySelector(\r\n        'link[rel=\"stylesheet\"][href*=\"theme\"]'\r\n    );\r\n    const themeStylesheetHref = themeStylesheetLink\r\n        ? themeStylesheetLink.getAttribute(\"href\")\r\n        : null;\r\n\r\n    if (themeStylesheetHref) {\r\n        const printStylesheetHref = themeStylesheetHref.replace(\r\n            /theme.*\\.css/,\r\n            \"print-worksheet.css\"\r\n        );\r\n        themeStylesheetLink.setAttribute(\"href\", printStylesheetHref);\r\n        await new Promise((resolve) => {\r\n            themeStylesheetLink.addEventListener(\"load\", resolve, {\r\n                once: true,\r\n            });\r\n        });\r\n    }\r\n\r\n    const printableSection = document.getElementById(printableSectionID);\r\n    if (!printableSection) {\r\n        console.error(\"No section found with ID:\", printableSectionID);\r\n        return;\r\n    }\r\n\r\n    const ptxContent = document.querySelector(\".ptx-content\");\r\n    const existingSections = ptxContent.querySelectorAll(\":scope > section\");\r\n    existingSections.forEach((sec) => ptxContent.removeChild(sec));\r\n    ptxContent.appendChild(printableSection);\r\n}\r\n", "/**\r\n * Solution rewriting for print preview.\r\n *\r\n * Converts <details>/<summary> solution elements into plain <div>s\r\n * with a heading, so they render properly in print layout.\r\n */\r\n\r\nexport function rewriteSolutions() {\r\n    const bornHiddenKnowls = document.querySelectorAll(\r\n        \".worksheet details, .handout details\"\r\n    );\r\n    bornHiddenKnowls.forEach(function (detail) {\r\n        const summary = detail.querySelector(\"summary\");\r\n        const content = detail.innerHTML.replace(summary.outerHTML, \"\");\r\n        const div = document.createElement(\"div\");\r\n        div.classList = detail.classList;\r\n        if (summary) {\r\n            const title = document.createElement(\"h5\");\r\n            title.innerHTML = summary.innerHTML;\r\n            div.appendChild(title);\r\n        }\r\n        const body = document.createElement(\"div\");\r\n        body.innerHTML = content;\r\n        div.appendChild(body);\r\n        detail.parentNode.replaceChild(div, detail);\r\n    });\r\n}\r\n", "/**\r\n * Print-preview initialization and controls.\r\n *\r\n * Orchestrates the print-preview workflow: loading the printout section,\r\n * setting up paper size controls, managing solution visibility, creating\r\n * or adjusting pages, and wiring up header/footer toggles.\r\n */\r\n\r\nimport { toPixels, setPageGeometryCSS } from \"./geometry.js\";\r\nimport {\r\n    adjustWorkspaceToFitPage,\r\n    toggleWorkspaceHighlight,\r\n} from \"./workspace.js\";\r\nimport {\r\n    flattenParagraphsSections,\r\n    waitForImages,\r\n    adjustPrintoutPages,\r\n    createPrintoutPages,\r\n} from \"./pages.js\";\r\nimport { addHeadersAndFootersToPrintout } from \"./headers-footers.js\";\r\nimport { getPaperSize } from \"./paper-size.js\";\r\nimport { loadPrintout } from \"./section-swap.js\";\r\nimport { rewriteSolutions } from \"./solutions.js\";\r\n\r\nexport async function initPrintPreview() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"printpreview\")) return;\r\n\r\n    const printableSectionID = urlParams.get(\"printpreview\");\r\n    await loadPrintout(printableSectionID);\r\n\r\n    // Parse margins\r\n    const marginList = document\r\n        .querySelector(\"section.worksheet, section.handout\")\r\n        .getAttribute(\"data-margins\")\r\n        .split(\" \");\r\n    const margins = {\r\n        top: toPixels(marginList[0] || \"0.75in\"),\r\n        right: toPixels(marginList[1] || \"0.75in\"),\r\n        bottom: toPixels(marginList[2] || \"0.75in\"),\r\n        left: toPixels(marginList[3] || \"0.75in\"),\r\n    };\r\n\r\n    rewriteSolutions();\r\n\r\n    // Paper size setup\r\n    let paperSize = getPaperSize();\r\n    if (paperSize) {\r\n        const radio = document.querySelector(\r\n            `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n        );\r\n        if (radio) radio.checked = true;\r\n        document.body.classList.remove(\"a4\", \"letter\");\r\n        document.body.classList.add(paperSize);\r\n        setPageGeometryCSS({ paperSize, margins });\r\n    }\r\n\r\n    // Paper size radio change handlers\r\n    const papersizeRadios = document.querySelectorAll(\r\n        'input[name=\"papersize\"]'\r\n    );\r\n    papersizeRadios.forEach((radio) => {\r\n        radio.addEventListener(\"change\", function () {\r\n            if (this.checked) {\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(this.value);\r\n                localStorage.setItem(\"papersize\", this.value);\r\n                setPageGeometryCSS({ paperSize: this.value, margins });\r\n                adjustWorkspaceToFitPage({\r\n                    paperSize: this.value,\r\n                    margins,\r\n                });\r\n            }\r\n        });\r\n    });\r\n\r\n    // Solution visibility checkboxes\r\n    for (const solutionType of [\"hint\", \"answer\", \"solution\"]) {\r\n        const checkbox = document.getElementById(\r\n            `hide-${solutionType}-checkbox`\r\n        );\r\n        if (!checkbox) continue;\r\n\r\n        const storageKey = `hide-${solutionType}`;\r\n        if (\r\n            (solutionType === \"answer\" || solutionType === \"solution\") &&\r\n            !localStorage.getItem(storageKey)\r\n        ) {\r\n            checkbox.checked = true;\r\n            localStorage.setItem(storageKey, \"true\");\r\n        }\r\n\r\n        checkbox.checked = localStorage.getItem(storageKey) === \"true\";\r\n        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.add(\"hidden\");\r\n            } else {\r\n                elem.classList.remove(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(storageKey, this.checked);\r\n            document\r\n                .querySelectorAll(`div.${solutionType}`)\r\n                .forEach((elem) => {\r\n                    if (checkbox.checked) {\r\n                        elem.classList.add(\"hidden\");\r\n                    } else {\r\n                        elem.classList.remove(\"hidden\");\r\n                    }\r\n                    adjustWorkspaceToFitPage({ paperSize, margins });\r\n                });\r\n        });\r\n    }\r\n\r\n    // Build pages\r\n    const printoutSection = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (printoutSection) {\r\n        flattenParagraphsSections(printoutSection);\r\n        await waitForImages(printoutSection);\r\n    }\r\n\r\n    if (document.querySelector(\".onepage\")) {\r\n        adjustPrintoutPages();\r\n    } else {\r\n        createPrintoutPages(margins);\r\n    }\r\n\r\n    addHeadersAndFootersToPrintout();\r\n\r\n    // Header/footer toggle checkboxes\r\n    for (const hf of [\r\n        \"first-page-header\",\r\n        \"running-header\",\r\n        \"first-page-footer\",\r\n        \"running-footer\",\r\n    ]) {\r\n        const checkbox = document.getElementById(`print-${hf}-checkbox`);\r\n        if (!checkbox) continue;\r\n\r\n        checkbox.checked =\r\n            localStorage.getItem(`print-${hf}`) === \"true\";\r\n        document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.remove(\"hidden\");\r\n            } else {\r\n                elem.classList.add(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(`print-${hf}`, this.checked);\r\n            document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n                if (checkbox.checked) {\r\n                    elem.classList.remove(\"hidden\");\r\n                } else {\r\n                    elem.classList.add(\"hidden\");\r\n                }\r\n                adjustWorkspaceToFitPage({ paperSize, margins });\r\n            });\r\n        });\r\n    }\r\n\r\n    // Adjust workspace heights\r\n    adjustWorkspaceToFitPage({ paperSize, margins });\r\n\r\n    // Highlight workspace checkbox\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    if (highlightCheckbox) {\r\n        highlightCheckbox.checked =\r\n            localStorage.getItem(\"highlightWorkspace\") === \"true\";\r\n        highlightCheckbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(\"highlightWorkspace\", this.checked);\r\n            toggleWorkspaceHighlight(this.checked);\r\n        });\r\n        toggleWorkspaceHighlight(highlightCheckbox.checked);\r\n    }\r\n}\r\n", "/**\r\n * Dark/light mode switching.\r\n *\r\n * Detects user preference via localStorage or `prefers-color-scheme`,\r\n * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.\r\n */\r\n\r\nexport function isDarkMode() {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return false;\r\n\r\n    const currentTheme = localStorage.getItem(\"theme\");\r\n    if (currentTheme === \"dark\") return true;\r\n    if (currentTheme === \"light\") return false;\r\n\r\n    return (\r\n        window.matchMedia &&\r\n        window.matchMedia(\"(prefers-color-scheme: dark)\").matches\r\n    );\r\n}\r\n\r\nexport function setDarkMode(isDark) {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return;\r\n\r\n    const parentHtml = document.documentElement;\r\n    const iframes = document.querySelectorAll(\r\n        \"iframe[data-dark-mode-enabled]\"\r\n    );\r\n\r\n    if (isDark) {\r\n        parentHtml.classList.add(\"dark-mode\");\r\n    } else {\r\n        parentHtml.classList.remove(\"dark-mode\");\r\n    }\r\n\r\n    // Sync each iframe's <html> class with the parent\r\n    for (const iframe of iframes) {\r\n        try {\r\n            const iframeHtml = iframe.contentWindow.document.documentElement;\r\n            if (isDark) {\r\n                iframeHtml.classList.add(\"dark-mode\");\r\n            } else {\r\n                iframeHtml.classList.remove(\"dark-mode\");\r\n            }\r\n        } catch (err) {\r\n            console.warn(\"Dark mode sync to iframe failed:\", err);\r\n        }\r\n    }\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.querySelector(\".icon\").innerText = isDark\r\n            ? \"light_mode\"\r\n            : \"dark_mode\";\r\n        modeButton.querySelector(\".name\").innerText = isDark\r\n            ? \"Light Mode\"\r\n            : \"Dark Mode\";\r\n    }\r\n}\r\n\r\nexport function initThemeToggle() {\r\n    // Run immediately to avoid flicker\r\n    setDarkMode(isDarkMode());\r\n\r\n    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)\r\n    const isDark = isDarkMode();\r\n    setDarkMode(isDark);\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.addEventListener(\"click\", function () {\r\n            const wasDark = isDarkMode();\r\n            setDarkMode(!wasDark);\r\n            localStorage.setItem(\"theme\", wasDark ? \"light\" : \"dark\");\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * Embed/share button and embed-mode display.\r\n *\r\n * Provides the \"embed in LMS\" button that copies an <iframe> snippet,\r\n * and strips chrome when the page is loaded in embed mode (?embed).\r\n */\r\n\r\nimport { setDarkMode } from \"./theme.js\";\r\n\r\nexport function initShareButton() {\r\n    const shareButton = document.getElementById(\"embed-button\");\r\n    if (!shareButton) return;\r\n\r\n    const sharePopup = document.getElementById(\"embed-popup\");\r\n    const embedCode =\r\n        \"<iframe src='\" +\r\n        window.location.href +\r\n        \"?embed' width='100%' height='1000px' frameborder='0'></iframe>\";\r\n    const embedTextbox = document.getElementById(\"embed-code-textbox\");\r\n    if (embedTextbox) {\r\n        embedTextbox.value = embedCode;\r\n    }\r\n\r\n    shareButton.addEventListener(\"click\", function () {\r\n        sharePopup.classList.toggle(\"hidden\");\r\n    });\r\n\r\n    const copyButton = document.getElementById(\"copy-embed-button\");\r\n    if (copyButton) {\r\n        copyButton.addEventListener(\"click\", function () {\r\n            const textbox = document.getElementById(\"embed-code-textbox\");\r\n            if (textbox) {\r\n                navigator.clipboard\r\n                    .writeText(embedCode)\r\n                    .then(() => {\r\n                        console.log(\"Embed code copied to clipboard!\");\r\n                    })\r\n                    .catch((err) => {\r\n                        console.error(\"Failed to copy embed code: \", err);\r\n                    });\r\n                copyButton.querySelector(\".icon\").innerText =\r\n                    \"library_add_check\";\r\n                setTimeout(function () {\r\n                    copyButton.querySelector(\".icon\").innerText =\r\n                        \"content_copy\";\r\n                    sharePopup.classList.add(\"hidden\");\r\n                }, 450);\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initEmbedMode() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"embed\")) return;\r\n\r\n    // Set dark mode based on value of param\r\n    if (urlParams.get(\"embed\") === \"dark\") {\r\n        setDarkMode(true);\r\n    } else {\r\n        setDarkMode(false);\r\n    }\r\n\r\n    const elemsToHide = [\r\n        \"ptx-navbar\",\r\n        \"ptx-masthead\",\r\n        \"ptx-page-footer\",\r\n        \"ptx-sidebar\",\r\n        \"ptx-content-footer\",\r\n    ];\r\n    for (const id of elemsToHide) {\r\n        const elem = document.getElementById(id);\r\n        if (elem) {\r\n            elem.classList.add(\"hidden\");\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Code block copy-to-clipboard button.\r\n *\r\n * Wraps `.clipboardable` elements with a container and injects a copy\r\n * button.  Clicking the button copies the `<pre>` content.\r\n */\r\n\r\nexport function initCodeCopyButtons() {\r\n    const elements = document.querySelectorAll(\".clipboardable\");\r\n    for (const el of elements) {\r\n        const div = document.createElement(\"div\");\r\n        div.classList.add(\"clipboardable\");\r\n        el.classList.remove(\"clipboardable\");\r\n        el.replaceWith(div);\r\n        div.insertAdjacentElement(\"afterbegin\", el);\r\n        div.insertAdjacentHTML(\r\n            \"beforeend\",\r\n            `\r\n    <button class=\"code-copy\" title=\"Copy code\" role=\"button\" aria-label=\"Copy code\" >\r\n        <span class=\"copyicon material-symbols-outlined\">content_copy</span>\r\n        <span class=\"checkmark material-symbols-outlined\">check</span>\r\n    </button>\r\n            `.trim()\r\n        );\r\n    }\r\n}\r\n\r\nexport function initCodeCopyHandler() {\r\n    document.addEventListener(\"click\", (ev) => {\r\n        const codeBox = ev.target.closest(\".clipboardable\");\r\n        if (!navigator.clipboard || !codeBox) return;\r\n        const button = ev.target.closest(\".code-copy\");\r\n        if (!button) return;\r\n        const preContent = codeBox.querySelector(\"pre\").textContent;\r\n        navigator.clipboard.writeText(preContent);\r\n        button.classList.toggle(\"copied\");\r\n        setTimeout(() => button.classList.toggle(\"copied\"), 1000);\r\n    });\r\n}\r\n", "/**\r\n * Auto-ID generation for paragraphs without IDs.\r\n *\r\n * \u26A0\uFE0F DEPRECATED / SUSPICIOUS: Generates IDs like \"base-id-part2\", \"base-id-part3\"\r\n * for <p> elements that lack an id, based on the nearest preceding <p> that has one.\r\n * Produces heavy console.log output. It is unclear whether any downstream code\r\n * depends on the generated IDs.\r\n */\r\n\r\nexport function initAutoId() {\r\n    const noIdParagraphs = document.querySelectorAll(\".main p:not([id])\");\r\n    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {\r\n        const e = noIdParagraphs[n];\r\n        if (e.hasAttribute(\"id\")) continue;\r\n        if (e.classList.contains(\"watermark\")) continue;\r\n\r\n        // Find all preceding sibling <p> elements\r\n        const prevParagraphs = [];\r\n        let sibling = e.previousElementSibling;\r\n        while (sibling) {\r\n            if (sibling.tagName === \"P\") {\r\n                prevParagraphs.push(sibling);\r\n            }\r\n            sibling = sibling.previousElementSibling;\r\n        }\r\n\r\n        if (prevParagraphs.length === 0) continue;\r\n\r\n        let partsFound = 1;\r\n        const partsToId = [e];\r\n        for (let i = 0; i < prevParagraphs.length; ++i) {\r\n            const thisPrevious = prevParagraphs[i];\r\n            if (!thisPrevious.hasAttribute(\"id\")) {\r\n                partsToId.unshift(thisPrevious);\r\n            } else {\r\n                const baseId = thisPrevious.id;\r\n                for (let j = 0; j < partsToId.length; ++j) {\r\n                    ++partsFound;\r\n                    const nextId = baseId + \"-part\" + partsFound.toString();\r\n                    partsToId[j].setAttribute(\"id\", nextId);\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Video magnification (resize YouTube iframes to full browser width).\r\n *\r\n * \u26A0\uFE0F DEAD CODE: The selector `body iframeXXXX` intentionally matches no\r\n * elements.  This module is preserved for reference but has no effect.\r\n */\r\n\r\nexport function initVideoMagnify() {\r\n    const allIframes = document.querySelectorAll(\"body iframeXXXX\");\r\n    for (let i = 0; i < allIframes.length; i++) {\r\n        const thisItem = allIframes[i];\r\n        const thisItemSrc = thisItem.src;\r\n        if (!thisItemSrc.includes(\"youtube\")) continue;\r\n\r\n        const thisItemId = thisItem.id;\r\n        const thisItemWidth = thisItem.width;\r\n        const thisItemHeight = thisItem.height;\r\n        if (thisItemHeight < 150) continue;\r\n\r\n        const emptyDiv = document.createElement(\"div\");\r\n        const videomagContainer = document.createElement(\"div\");\r\n        const parentTag = thisItem.parentElement.tagName;\r\n        if (parentTag === \"FIGURE\") {\r\n            videomagContainer.setAttribute(\"class\", \"videobig\");\r\n        } else {\r\n            videomagContainer.setAttribute(\"class\", \"videobig nofigure\");\r\n        }\r\n        videomagContainer.setAttribute(\"video-id\", thisItemId);\r\n        videomagContainer.setAttribute(\"data-width\", thisItemWidth);\r\n        videomagContainer.setAttribute(\"data-height\", thisItemHeight);\r\n        videomagContainer.innerHTML = \"fit width\";\r\n\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", videomagContainer);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n    }\r\n\r\n    // Toggle handlers\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const bigBtn = event.target.closest(\".videobig\");\r\n        if (bigBtn) {\r\n            const videoId = bigBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = parseInt(bigBtn.getAttribute(\"data-width\"));\r\n            const originalHeight = parseInt(bigBtn.getAttribute(\"data-height\"));\r\n            const browserWidth = window.innerWidth;\r\n            const widthRatio = browserWidth / originalWidth;\r\n\r\n            video.setAttribute(\"width\", widthRatio * originalWidth);\r\n            video.setAttribute(\"height\", widthRatio * originalHeight);\r\n            video.setAttribute(\r\n                \"style\",\r\n                \"position:relative; left:-260px; z-index:1000\"\r\n            );\r\n            bigBtn.setAttribute(\"class\", \"videosmall\");\r\n            bigBtn.innerHTML = \"make small\";\r\n            return;\r\n        }\r\n\r\n        const smallBtn = event.target.closest(\".videosmall\");\r\n        if (smallBtn) {\r\n            const videoId = smallBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = smallBtn.getAttribute(\"data-width\");\r\n            const originalHeight = smallBtn.getAttribute(\"data-height\");\r\n\r\n            video.removeAttribute(\"style\");\r\n            video.setAttribute(\"width\", originalWidth);\r\n            video.setAttribute(\"height\", originalHeight);\r\n            smallBtn.setAttribute(\"class\", \"videobig\");\r\n            smallBtn.innerHTML = \"fit width\";\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * PreTeXt Core \u2014 main entry point.\r\n *\r\n * Bundles all core PreTeXt JavaScript into a single IIFE script.\r\n * This replaces the old pattern of loading jquery.min.js + pretext.js +\r\n * pretext_add_on.js + knowl.js + lti_iframe_resizer.js as separate scripts.\r\n */\r\n\r\n// --- Core modules (from pretext.js, knowl.js, lti_iframe_resizer.js) ---\r\nimport { initToc, initFocusedToc, initScrollToc } from \"./toc.js\";\r\nimport { initKnowls } from \"./knowl.js\";\r\nimport { initLtiIframeResizer } from \"./lti-iframe-resizer.js\";\r\n\r\n// --- Modules extracted from pretext_add_on.js ---\r\nimport { initPermalinks } from \"./permalink.js\";\r\nimport { initImageMagnify } from \"./image-magnify.js\";\r\nimport { initGeoGebra } from \"./geogebra.js\";\r\nimport { initKeyboardNav, initAnchorKnowl } from \"./keyboard-nav.js\";\r\nimport { initPrintPreview } from \"./print-preview/index.js\";\r\nimport { isDarkMode, setDarkMode, initThemeToggle } from \"./theme.js\";\r\nimport { initShareButton, initEmbedMode } from \"./embed.js\";\r\nimport { initCodeCopyButtons, initCodeCopyHandler } from \"./code-copy.js\";\r\n\r\n// --- Deprecated modules (included but flagged for future removal) ---\r\nimport { initAutoId } from \"./deprecated/auto-id.js\";\r\nimport { initVideoMagnify } from \"./deprecated/video-magnify.js\";\r\n\r\n// Run dark mode immediately to avoid flash of wrong theme\r\nsetDarkMode(isDarkMode());\r\n\r\n// --- DOMContentLoaded handlers ---\r\nwindow.addEventListener(\"DOMContentLoaded\", function () {\r\n    // TOC and sidebar\r\n    initToc();\r\n    initFocusedToc();\r\n    initScrollToc();\r\n\r\n    // Permalinks\r\n    initPermalinks();\r\n\r\n    // Theme toggle button\r\n    initThemeToggle();\r\n\r\n    // Embed/share button and embed mode\r\n    initShareButton();\r\n    initEmbedMode();\r\n\r\n    // Code copy buttons\r\n    initCodeCopyButtons();\r\n\r\n    // Print preview (conditionally activates based on URL params)\r\n    initPrintPreview();\r\n});\r\n\r\n// --- Load handlers (need full page including images/styles) ---\r\nwindow.addEventListener(\"load\", function () {\r\n    // Knowls\r\n    initKnowls();\r\n\r\n    // LTI iframe resizer\r\n    initLtiIframeResizer();\r\n\r\n    // Image magnification\r\n    initImageMagnify();\r\n\r\n    // GeoGebra calculator\r\n    initGeoGebra();\r\n\r\n    // Keyboard navigation (ESC/ENTER)\r\n    initKeyboardNav();\r\n\r\n    // Anchor-based knowl opening\r\n    initAnchorKnowl();\r\n\r\n    // Deprecated: auto-ID generation\r\n    initAutoId();\r\n\r\n    // Deprecated: video magnification (dead code \u2014 selector matches nothing)\r\n    initVideoMagnify();\r\n});\r\n\r\n// Code copy click handler (uses event delegation, safe to register early)\r\ninitCodeCopyHandler();\r\n"],
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+  "names": ["event", "tempContainer", "event", "event", "event", "event", "event", "workspaces", "totalHeight", "nextChild", "content", "content", "event"]
+}
diff --git a/js/dist/pretext-search.js b/js/dist/pretext-search.js
new file mode 100644
index 000000000..4ec2b4ba6
--- /dev/null
+++ b/js/dist/pretext-search.js
@@ -0,0 +1,263 @@
+(() => {
+  // ../../js/src/search.js
+  function findEntry(resultId, db) {
+    for (const page of db) {
+      if (page.id === resultId) return page;
+    }
+    return resultId;
+  }
+  function augmentResults(result, docs) {
+    for (let res of result) {
+      let info = findEntry(res.ref, docs);
+      res.number = info.number;
+      res.type = info.type;
+      res.title = info.title;
+      res.url = info.url;
+      res.level = info.level;
+      res.snum = info.snum;
+      res.score = parseFloat(res.score);
+      const LEVEL_WEIGHTS = [3, 2, 1.5];
+      if (res.level < 2) res.score *= LEVEL_WEIGHTS[res.level];
+      res.body = "";
+      const REVEAL_WINDOW = 30;
+      let titleMarked = false;
+      for (const hit in res.matchData.metadata) {
+        if (res.matchData.metadata[hit].title) {
+          if (!titleMarked) {
+            if (!res.matchData.metadata[hit].title.position)
+              continue;
+            let positionData = res.matchData.metadata[hit].title.position[0];
+            const startClipInd = positionData[0];
+            const endClipInd = positionData[0] + positionData[1];
+            res.title = res.title.substring(0, endClipInd) + "</span>" + res.title.substring(endClipInd);
+            res.title = res.title.substring(0, startClipInd) + '<span class="search-result-clip-highlight">' + res.title.substring(startClipInd);
+            titleMarked = true;
+          }
+        } else if (res.matchData.metadata[hit].body) {
+          if (!res.matchData.metadata[hit].body.position)
+            continue;
+          const bodyContent = info.body;
+          let positionData = res.matchData.metadata[hit].body.position[0];
+          const startInd = positionData[0] - REVEAL_WINDOW;
+          const endInd = positionData[0] + positionData[1] + REVEAL_WINDOW;
+          const startClipInd = positionData[0];
+          const endClipInd = positionData[0] + positionData[1];
+          let resultSnippet = (startInd > 0 ? "..." : "") + bodyContent.substring(startInd, startClipInd);
+          resultSnippet += '<span class="search-result-clip-highlight">' + bodyContent.substring(startClipInd, endClipInd) + "</span>";
+          resultSnippet += bodyContent.substring(endClipInd, endInd) + (endInd < bodyContent.length ? "..." : "") + "<br/>";
+          res.body += resultSnippet;
+        }
+      }
+    }
+  }
+  function rearrangedArray(arry) {
+    let newarry = [];
+    let ct = 1;
+    while (arry.length > 0 && ct < 500) {
+      ++ct;
+      const locofmax = maxLocation(arry);
+      let segmentstart = locofmax;
+      let segmentlength = 1;
+      while (arry[segmentstart].level == "2") {
+        --segmentstart;
+      }
+      while (segmentstart + segmentlength < arry.length && arry[segmentstart + segmentlength].level == "2") {
+        ++segmentlength;
+      }
+      newarry.push(...arry.splice(segmentstart, segmentlength));
+    }
+    return newarry;
+  }
+  function maxLocation(arry) {
+    let maxloc = 0;
+    let maxvalsofar = -1;
+    for (let index = 0; index < arry.length; ++index) {
+      if (arry[index].score > maxvalsofar) {
+        maxloc = index;
+        maxvalsofar = arry[index].score;
+      }
+    }
+    return maxloc;
+  }
+  function comparePosition(a, b) {
+    if (a.snum < b.snum) return -1;
+    if (a.snum > b.snum) return 1;
+    return 0;
+  }
+  function addResultToPage(searchterms, result, docs, numUnshown, resultArea) {
+    if (document.getElementById("searchempty")) {
+      document.getElementById("searchempty").style.display = "none";
+    }
+    let len = result.length;
+    if (len == 0) {
+      if (document.getElementById("searchempty")) {
+        document.getElementById("searchempty").style.display = "block";
+      } else {
+        let noresults = document.createElement("div");
+        noresults.classList.add("noresults");
+        noresults.innerHTML = "No results were found.";
+        resultArea.appendChild(noresults);
+      }
+      document.getElementById("searchresultsplaceholder").style.display = null;
+      return;
+    }
+    let allScores = result.map(function(r) {
+      return r.score;
+    });
+    allScores.sort((a, b) => a - b);
+    allScores.reverse();
+    let high = allScores[Math.floor(len * 0.2)];
+    let med = allScores[Math.floor(len * 0.4)];
+    let low = allScores[Math.floor(len * 0.75)];
+    if (typeof ptx_lunr_search_style !== "undefined" && ptx_lunr_search_style == "reference") {
+      result = rearrangedArray(result);
+    }
+    let indent = "1";
+    let currIndent = indent;
+    let origResult = resultArea;
+    for (const res of result) {
+      let link = document.createElement("a");
+      if (res.score >= high) {
+        link.classList.add("high_result");
+      } else if (res.score >= med) {
+        link.classList.add("medium_result");
+      } else if (res.score >= low) {
+        link.classList.add("low_result");
+      } else {
+        link.classList.add("no_result");
+      }
+      currIndent = res.level;
+      if (currIndent > indent) {
+        indent = currIndent;
+        let ilist = document.createElement("ul");
+        ilist.classList.add("detailed_result");
+        resultArea.appendChild(ilist);
+        resultArea = ilist;
+      } else if (currIndent < indent) {
+        resultArea = origResult;
+        indent = currIndent;
+      }
+      link.href = `${res.url}`;
+      link.innerHTML = `${res.type} ${res.number} ${res.title}`;
+      let clip = document.createElement("div");
+      clip.classList.add("search-result-clip");
+      clip.innerHTML = `${res.body}`;
+      let bullet = document.createElement("li");
+      bullet.classList.add("search-result-bullet");
+      bullet.appendChild(link);
+      bullet.appendChild(clip);
+      let p = document.createElement("text");
+      p.classList.add("search-result-score");
+      p.innerHTML = `  (${res.score.toFixed(2)})`;
+      bullet.appendChild(p);
+      resultArea.appendChild(bullet);
+    }
+    const resultsDiv = document.getElementById("searchresultsplaceholder");
+    const backDiv = document.querySelector(".searchresultsbackground");
+    resultArea.querySelectorAll("a").forEach((link) => {
+      link.addEventListener("click", (e) => {
+        backDiv.style.display = "none";
+        resultsDiv.style.display = "none";
+      });
+    });
+    document.getElementById("searchresultsplaceholder").style.display = null;
+    MathJax.typesetPromise();
+  }
+  function doSearch(searchlocation = "A") {
+    let terms;
+    if (searchlocation == "A") {
+      terms = document.getElementById("ptxsearch").value;
+    } else {
+      terms = document.getElementById("ptxsearchB").value;
+    }
+    localStorage.setItem(
+      "last-search-terms",
+      JSON.stringify({ terms, time: Date.now() })
+    );
+    let resultArea = document.getElementById("searchresults");
+    resultArea.innerHTML = "";
+    let searchterms = terms;
+    if (searchlocation == "B") {
+      document.getElementById("ptxsearch").value = searchterms;
+    }
+    searchterms = searchterms.toLowerCase().trim();
+    let pageResult = [];
+    if (searchterms != "") {
+      pageResult = ptx_lunr_idx.query((q) => {
+        for (let term of searchterms.split(" ")) {
+          q.term(term, { fields: ["title"], boost: 20 });
+          q.term(term, {
+            wildcard: lunr.Query.wildcard.TRAILING,
+            fields: ["title"],
+            boost: 10
+          });
+          q.term(term, { fields: ["body"], boost: 5 });
+          q.term(term, {
+            wildcard: lunr.Query.wildcard.TRAILING,
+            fields: ["body"]
+          });
+        }
+      });
+    }
+    let snum = 0;
+    for (let doc of ptx_lunr_docs) {
+      doc.snum = snum;
+      snum += 1;
+    }
+    const MAX_RESULTS = 100;
+    let numUnshown = pageResult.length > MAX_RESULTS ? pageResult.length - MAX_RESULTS : 0;
+    pageResult = pageResult.slice(0, MAX_RESULTS);
+    augmentResults(pageResult, ptx_lunr_docs);
+    pageResult.sort(comparePosition);
+    addResultToPage(
+      terms,
+      pageResult,
+      ptx_lunr_docs,
+      numUnshown,
+      resultArea
+    );
+    MathJax.typeset();
+  }
+  function initSearch() {
+    const resultsDiv = document.getElementById("searchresultsplaceholder");
+    if (!resultsDiv) return;
+    const backDiv = document.createElement("div");
+    backDiv.classList.add("searchresultsbackground");
+    backDiv.style.display = "none";
+    resultsDiv.parentNode.appendChild(backDiv);
+    const searchButton = document.getElementById("searchbutton");
+    if (searchButton) {
+      searchButton.addEventListener("click", (e) => {
+        resultsDiv.style.display = null;
+        backDiv.style.display = null;
+        let searchInput2 = document.getElementById("ptxsearch");
+        const lastSearch = localStorage.getItem("last-search-terms");
+        if (lastSearch) {
+          searchInput2.value = JSON.parse(lastSearch).terms;
+        }
+        searchInput2.select();
+        doSearch();
+      });
+    }
+    const searchInput = document.getElementById("ptxsearch");
+    if (searchInput) {
+      searchInput.addEventListener("input", (e) => {
+        doSearch();
+      });
+    }
+    const closeButton = document.getElementById("closesearchresults");
+    if (closeButton) {
+      closeButton.addEventListener("click", (e) => {
+        resultsDiv.style.display = "none";
+        backDiv.style.display = "none";
+        document.getElementById("searchbutton").focus();
+      });
+    }
+  }
+
+  // ../../js/src/pretext-search-entry.js
+  window.addEventListener("load", function() {
+    initSearch();
+  });
+})();
+//# sourceMappingURL=pretext-search.js.map
diff --git a/js/dist/pretext-search.js.map b/js/dist/pretext-search.js.map
new file mode 100644
index 000000000..be82ef627
--- /dev/null
+++ b/js/dist/pretext-search.js.map
@@ -0,0 +1,7 @@
+{
+  "version": 3,
+  "sources": ["../src/search.js", "../src/pretext-search-entry.js"],
+  "sourcesContent": ["/**\r\n * Search functionality (from pretext_search.js).\r\n *\r\n * Provides the search UI: querying the lunr index, ranking results,\r\n * rendering result lists with highlighted snippets.\r\n *\r\n * Expects these globals from the generated lunr-pretext-search-index.js:\r\n *   - ptx_lunr_idx\r\n *   - ptx_lunr_docs\r\n *   - ptx_lunr_search_style\r\n * Also expects: lunr (the lunr.js library), MathJax\r\n */\r\n\r\nfunction findEntry(resultId, db) {\r\n    for (const page of db) {\r\n        if (page.id === resultId) return page;\r\n    }\r\n    return resultId;\r\n}\r\n\r\nfunction augmentResults(result, docs) {\r\n    for (let res of result) {\r\n        let info = findEntry(res.ref, docs);\r\n        res.number = info.number;\r\n        res.type = info.type;\r\n        res.title = info.title;\r\n        res.url = info.url;\r\n        res.level = info.level;\r\n        res.snum = info.snum;\r\n        res.score = parseFloat(res.score);\r\n\r\n        const LEVEL_WEIGHTS = [3, 2, 1.5];\r\n        if (res.level < 2) res.score *= LEVEL_WEIGHTS[res.level];\r\n\r\n        res.body = \"\";\r\n        const REVEAL_WINDOW = 30;\r\n        let titleMarked = false;\r\n        for (const hit in res.matchData.metadata) {\r\n            if (res.matchData.metadata[hit].title) {\r\n                if (!titleMarked) {\r\n                    if (!res.matchData.metadata[hit].title.position)\r\n                        continue;\r\n                    let positionData =\r\n                        res.matchData.metadata[hit].title.position[0];\r\n                    const startClipInd = positionData[0];\r\n                    const endClipInd = positionData[0] + positionData[1];\r\n                    res.title =\r\n                        res.title.substring(0, endClipInd) +\r\n                        \"</span>\" +\r\n                        res.title.substring(endClipInd);\r\n                    res.title =\r\n                        res.title.substring(0, startClipInd) +\r\n                        '<span class=\"search-result-clip-highlight\">' +\r\n                        res.title.substring(startClipInd);\r\n                    titleMarked = true;\r\n                }\r\n            } else if (res.matchData.metadata[hit].body) {\r\n                if (!res.matchData.metadata[hit].body.position)\r\n                    continue;\r\n                const bodyContent = info.body;\r\n                let positionData =\r\n                    res.matchData.metadata[hit].body.position[0];\r\n                const startInd = positionData[0] - REVEAL_WINDOW;\r\n                const endInd =\r\n                    positionData[0] + positionData[1] + REVEAL_WINDOW;\r\n                const startClipInd = positionData[0];\r\n                const endClipInd = positionData[0] + positionData[1];\r\n                let resultSnippet =\r\n                    (startInd > 0 ? \"...\" : \"\") +\r\n                    bodyContent.substring(startInd, startClipInd);\r\n                resultSnippet +=\r\n                    '<span class=\"search-result-clip-highlight\">' +\r\n                    bodyContent.substring(startClipInd, endClipInd) +\r\n                    \"</span>\";\r\n                resultSnippet +=\r\n                    bodyContent.substring(endClipInd, endInd) +\r\n                    (endInd < bodyContent.length ? \"...\" : \"\") +\r\n                    \"<br/>\";\r\n                res.body += resultSnippet;\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nfunction rearrangedArray(arry) {\r\n    let newarry = [];\r\n    let ct = 1;\r\n    while (arry.length > 0 && ct < 500) {\r\n        ++ct;\r\n        const locofmax = maxLocation(arry);\r\n        let segmentstart = locofmax;\r\n        let segmentlength = 1;\r\n        while (arry[segmentstart].level == \"2\") {\r\n            --segmentstart;\r\n        }\r\n        while (\r\n            segmentstart + segmentlength < arry.length &&\r\n            arry[segmentstart + segmentlength].level == \"2\"\r\n        ) {\r\n            ++segmentlength;\r\n        }\r\n        newarry.push(...arry.splice(segmentstart, segmentlength));\r\n    }\r\n    return newarry;\r\n}\r\n\r\nfunction maxLocation(arry) {\r\n    let maxloc = 0;\r\n    let maxvalsofar = -1;\r\n    for (let index = 0; index < arry.length; ++index) {\r\n        if (arry[index].score > maxvalsofar) {\r\n            maxloc = index;\r\n            maxvalsofar = arry[index].score;\r\n        }\r\n    }\r\n    return maxloc;\r\n}\r\n\r\nfunction comparePosition(a, b) {\r\n    if (a.snum < b.snum) return -1;\r\n    if (a.snum > b.snum) return 1;\r\n    return 0;\r\n}\r\n\r\nfunction addResultToPage(searchterms, result, docs, numUnshown, resultArea) {\r\n    if (document.getElementById(\"searchempty\")) {\r\n        document.getElementById(\"searchempty\").style.display = \"none\";\r\n    }\r\n    let len = result.length;\r\n    if (len == 0) {\r\n        if (document.getElementById(\"searchempty\")) {\r\n            document.getElementById(\"searchempty\").style.display = \"block\";\r\n        } else {\r\n            let noresults = document.createElement(\"div\");\r\n            noresults.classList.add(\"noresults\");\r\n            noresults.innerHTML = \"No results were found.\";\r\n            resultArea.appendChild(noresults);\r\n        }\r\n        document.getElementById(\"searchresultsplaceholder\").style.display =\r\n            null;\r\n        return;\r\n    }\r\n\r\n    let allScores = result.map(function (r) {\r\n        return r.score;\r\n    });\r\n    allScores.sort((a, b) => a - b);\r\n    allScores.reverse();\r\n\r\n    let high = allScores[Math.floor(len * 0.2)];\r\n    let med = allScores[Math.floor(len * 0.4)];\r\n    let low = allScores[Math.floor(len * 0.75)];\r\n\r\n    if (\r\n        typeof ptx_lunr_search_style !== \"undefined\" &&\r\n        ptx_lunr_search_style == \"reference\"\r\n    ) {\r\n        result = rearrangedArray(result);\r\n    }\r\n    let indent = \"1\";\r\n    let currIndent = indent;\r\n    let origResult = resultArea;\r\n\r\n    for (const res of result) {\r\n        let link = document.createElement(\"a\");\r\n        if (res.score >= high) {\r\n            link.classList.add(\"high_result\");\r\n        } else if (res.score >= med) {\r\n            link.classList.add(\"medium_result\");\r\n        } else if (res.score >= low) {\r\n            link.classList.add(\"low_result\");\r\n        } else {\r\n            link.classList.add(\"no_result\");\r\n        }\r\n        currIndent = res.level;\r\n        if (currIndent > indent) {\r\n            indent = currIndent;\r\n            let ilist = document.createElement(\"ul\");\r\n            ilist.classList.add(\"detailed_result\");\r\n            resultArea.appendChild(ilist);\r\n            resultArea = ilist;\r\n        } else if (currIndent < indent) {\r\n            resultArea = origResult;\r\n            indent = currIndent;\r\n        }\r\n        link.href = `${res.url}`;\r\n        link.innerHTML = `${res.type} ${res.number} ${res.title}`;\r\n        let clip = document.createElement(\"div\");\r\n        clip.classList.add(\"search-result-clip\");\r\n        clip.innerHTML = `${res.body}`;\r\n        let bullet = document.createElement(\"li\");\r\n        bullet.classList.add(\"search-result-bullet\");\r\n        bullet.appendChild(link);\r\n        bullet.appendChild(clip);\r\n        let p = document.createElement(\"text\");\r\n        p.classList.add(\"search-result-score\");\r\n        p.innerHTML = `  (${res.score.toFixed(2)})`;\r\n        bullet.appendChild(p);\r\n        resultArea.appendChild(bullet);\r\n    }\r\n\r\n    const resultsDiv = document.getElementById(\"searchresultsplaceholder\");\r\n    const backDiv = document.querySelector(\".searchresultsbackground\");\r\n    resultArea.querySelectorAll(\"a\").forEach((link) => {\r\n        link.addEventListener(\"click\", (e) => {\r\n            backDiv.style.display = \"none\";\r\n            resultsDiv.style.display = \"none\";\r\n        });\r\n    });\r\n    document.getElementById(\"searchresultsplaceholder\").style.display = null;\r\n    MathJax.typesetPromise();\r\n}\r\n\r\nfunction doSearch(searchlocation = \"A\") {\r\n    let terms;\r\n    if (searchlocation == \"A\") {\r\n        terms = document.getElementById(\"ptxsearch\").value;\r\n    } else {\r\n        terms = document.getElementById(\"ptxsearchB\").value;\r\n    }\r\n\r\n    localStorage.setItem(\r\n        \"last-search-terms\",\r\n        JSON.stringify({ terms: terms, time: Date.now() })\r\n    );\r\n\r\n    let resultArea = document.getElementById(\"searchresults\");\r\n    resultArea.innerHTML = \"\";\r\n\r\n    let searchterms = terms;\r\n    if (searchlocation == \"B\") {\r\n        document.getElementById(\"ptxsearch\").value = searchterms;\r\n    }\r\n\r\n    searchterms = searchterms.toLowerCase().trim();\r\n    let pageResult = [];\r\n    if (searchterms != \"\") {\r\n        pageResult = ptx_lunr_idx.query((q) => {\r\n            for (let term of searchterms.split(\" \")) {\r\n                q.term(term, { fields: [\"title\"], boost: 20 });\r\n                q.term(term, {\r\n                    wildcard: lunr.Query.wildcard.TRAILING,\r\n                    fields: [\"title\"],\r\n                    boost: 10,\r\n                });\r\n                q.term(term, { fields: [\"body\"], boost: 5 });\r\n                q.term(term, {\r\n                    wildcard: lunr.Query.wildcard.TRAILING,\r\n                    fields: [\"body\"],\r\n                });\r\n            }\r\n        });\r\n    }\r\n\r\n    let snum = 0;\r\n    for (let doc of ptx_lunr_docs) {\r\n        doc.snum = snum;\r\n        snum += 1;\r\n    }\r\n\r\n    const MAX_RESULTS = 100;\r\n    let numUnshown =\r\n        pageResult.length > MAX_RESULTS\r\n            ? pageResult.length - MAX_RESULTS\r\n            : 0;\r\n    pageResult = pageResult.slice(0, MAX_RESULTS);\r\n\r\n    augmentResults(pageResult, ptx_lunr_docs);\r\n    pageResult.sort(comparePosition);\r\n    addResultToPage(\r\n        terms,\r\n        pageResult,\r\n        ptx_lunr_docs,\r\n        numUnshown,\r\n        resultArea\r\n    );\r\n    MathJax.typeset();\r\n}\r\n\r\nexport function initSearch() {\r\n    const resultsDiv = document.getElementById(\"searchresultsplaceholder\");\r\n    if (!resultsDiv) return;\r\n\r\n    const backDiv = document.createElement(\"div\");\r\n    backDiv.classList.add(\"searchresultsbackground\");\r\n    backDiv.style.display = \"none\";\r\n    resultsDiv.parentNode.appendChild(backDiv);\r\n\r\n    const searchButton = document.getElementById(\"searchbutton\");\r\n    if (searchButton) {\r\n        searchButton.addEventListener(\"click\", (e) => {\r\n            resultsDiv.style.display = null;\r\n            backDiv.style.display = null;\r\n            let searchInput = document.getElementById(\"ptxsearch\");\r\n            const lastSearch = localStorage.getItem(\"last-search-terms\");\r\n            if (lastSearch) {\r\n                searchInput.value = JSON.parse(lastSearch).terms;\r\n            }\r\n            searchInput.select();\r\n            doSearch();\r\n        });\r\n    }\r\n\r\n    const searchInput = document.getElementById(\"ptxsearch\");\r\n    if (searchInput) {\r\n        searchInput.addEventListener(\"input\", (e) => {\r\n            doSearch();\r\n        });\r\n    }\r\n\r\n    const closeButton = document.getElementById(\"closesearchresults\");\r\n    if (closeButton) {\r\n        closeButton.addEventListener(\"click\", (e) => {\r\n            resultsDiv.style.display = \"none\";\r\n            backDiv.style.display = \"none\";\r\n            document.getElementById(\"searchbutton\").focus();\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * PreTeXt Search \u2014 search bundle entry point.\r\n *\r\n * Bundles the native search UI. Loaded only when the document\r\n * has native search enabled ($has-native-search).\r\n *\r\n * Expects these globals to be available (from lunr-pretext-search-index.js):\r\n *   - ptx_lunr_idx\r\n *   - ptx_lunr_docs\r\n *   - ptx_lunr_search_style\r\n * And from the lunr.js library:\r\n *   - lunr\r\n */\r\n\r\nimport { initSearch } from \"./search.js\";\r\n\r\nwindow.addEventListener(\"load\", function () {\r\n    initSearch();\r\n});\r\n"],
+  "mappings": 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diff --git a/js/jquery.min.js b/js/jquery.min.js
deleted file mode 100644
index 4d9b3a258..000000000
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diff --git a/js/src/pretext-core-entry.js b/js/src/pretext-core-entry.js
new file mode 100644
index 000000000..7f7b750e6
--- /dev/null
+++ b/js/src/pretext-core-entry.js
@@ -0,0 +1,83 @@
+/**
+ * PreTeXt Core — main entry point.
+ *
+ * Bundles all core PreTeXt JavaScript into a single IIFE script.
+ * This replaces the old pattern of loading jquery.min.js + pretext.js +
+ * pretext_add_on.js + knowl.js + lti_iframe_resizer.js as separate scripts.
+ */
+
+// --- Core modules (from pretext.js, knowl.js, lti_iframe_resizer.js) ---
+import { initToc, initFocusedToc, initScrollToc } from "./toc.js";
+import { initKnowls } from "./knowl.js";
+import { initLtiIframeResizer } from "./lti-iframe-resizer.js";
+
+// --- Modules extracted from pretext_add_on.js ---
+import { initPermalinks } from "./permalink.js";
+import { initImageMagnify } from "./image-magnify.js";
+import { initGeoGebra } from "./geogebra.js";
+import { initKeyboardNav, initAnchorKnowl } from "./keyboard-nav.js";
+import { initPrintPreview } from "./print-preview/index.js";
+import { isDarkMode, setDarkMode, initThemeToggle } from "./theme.js";
+import { initShareButton, initEmbedMode } from "./embed.js";
+import { initCodeCopyButtons, initCodeCopyHandler } from "./code-copy.js";
+
+// --- Deprecated modules (included but flagged for future removal) ---
+import { initAutoId } from "./deprecated/auto-id.js";
+import { initVideoMagnify } from "./deprecated/video-magnify.js";
+
+// Run dark mode immediately to avoid flash of wrong theme
+setDarkMode(isDarkMode());
+
+// --- DOMContentLoaded handlers ---
+window.addEventListener("DOMContentLoaded", function () {
+    // TOC and sidebar
+    initToc();
+    initFocusedToc();
+    initScrollToc();
+
+    // Permalinks
+    initPermalinks();
+
+    // Theme toggle button
+    initThemeToggle();
+
+    // Embed/share button and embed mode
+    initShareButton();
+    initEmbedMode();
+
+    // Code copy buttons
+    initCodeCopyButtons();
+
+    // Print preview (conditionally activates based on URL params)
+    initPrintPreview();
+});
+
+// --- Load handlers (need full page including images/styles) ---
+window.addEventListener("load", function () {
+    // Knowls
+    initKnowls();
+
+    // LTI iframe resizer
+    initLtiIframeResizer();
+
+    // Image magnification
+    initImageMagnify();
+
+    // GeoGebra calculator
+    initGeoGebra();
+
+    // Keyboard navigation (ESC/ENTER)
+    initKeyboardNav();
+
+    // Anchor-based knowl opening
+    initAnchorKnowl();
+
+    // Deprecated: auto-ID generation
+    initAutoId();
+
+    // Deprecated: video magnification (dead code — selector matches nothing)
+    initVideoMagnify();
+});
+
+// Code copy click handler (uses event delegation, safe to register early)
+initCodeCopyHandler();
diff --git a/js/src/pretext-search-entry.js b/js/src/pretext-search-entry.js
new file mode 100644
index 000000000..be9ee46dd
--- /dev/null
+++ b/js/src/pretext-search-entry.js
@@ -0,0 +1,19 @@
+/**
+ * PreTeXt Search — search bundle entry point.
+ *
+ * Bundles the native search UI. Loaded only when the document
+ * has native search enabled ($has-native-search).
+ *
+ * Expects these globals to be available (from lunr-pretext-search-index.js):
+ *   - ptx_lunr_idx
+ *   - ptx_lunr_docs
+ *   - ptx_lunr_search_style
+ * And from the lunr.js library:
+ *   - lunr
+ */
+
+import { initSearch } from "./search.js";
+
+window.addEventListener("load", function () {
+    initSearch();
+});

From 0d6896e3a55aface2a2356d04de5673e070abdf1 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:18:47 -0600
Subject: [PATCH 07/12] Update XSL to load bundled JS from dist/ (Phase 5)

pretext-js template:
- Replace 3 script tags (jquery.min.js, pretext.js, pretext_add_on.js)
  with single dist/pretext-core.js

knowl template:
- Remove standalone knowl.js script tag (now in core bundle)
- Keep sagecell eval name inline script

lti-iframe-resizer template:
- Remove standalone lti_iframe_resizer.js script tag (now in core bundle)
- Template kept empty so callers don't break

native-search-box-js template:
- Load dist/pretext-search.js instead of pretext_search.js

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 xsl/pretext-html.xsl | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/xsl/pretext-html.xsl b/xsl/pretext-html.xsl
index f0884659a..5a16f4fd8 100644
--- a/xsl/pretext-html.xsl
+++ b/xsl/pretext-html.xsl
@@ -10872,8 +10872,8 @@ along with MathBook XML.  If not, see <http://www.gnu.org/licenses/>.
 </xsl:template>
 
 <!-- lti-iframe-resizer -->
+<!-- lti_iframe_resizer.js is now bundled into dist/pretext-core.js -->
 <xsl:template name="lti-iframe-resizer">
-    <script src="{$html.js.dir}/lti_iframe_resizer.js"></script>
 </xsl:template>
 
 
@@ -12470,7 +12470,7 @@ along with MathBook XML.  If not, see <http://www.gnu.org/licenses/>.
             <xsl:text>true);&#xa;</xsl:text>
             <!--   The calculator is created by                    -->
             <!--   ggbApp.inject('geogebra-calculator');           -->
-            <!--   which is inserted by code in pretext_add_on.js  -->
+            <!--   which is inserted by code in dist/pretext-core.js -->
         </script>
     </xsl:if>
 </xsl:template>
@@ -13755,7 +13755,7 @@ TODO:
         <!-- document-specific variables with search documents -->
         <script src="{$lunr-search-file}" async=""/>
         <!-- PreTeXt Javascript and CSS to form and render results of a search -->
-        <script src="{$html.js.dir}/pretext_search.js"/>
+        <script src="{$html.js.dir}/dist/pretext-search.js"/>
         <!-- CSS for search is bundled into theme.css -->
     </xsl:if>
 </xsl:template>
@@ -13808,11 +13808,9 @@ TODO:
 </xsl:template>
 
 <!-- Knowl header -->
+<!-- knowl.js is now bundled into dist/pretext-core.js -->
 <xsl:template match="*" mode="knowl">
     <xsl:if test="not($b-debug-react)">
-        <script src="{$html.js.dir}/knowl.js"></script>
-        <!-- Variables are defined to defaults in knowl.js and  -->
-        <!-- we can override them with new values here          -->
         <xsl:comment>knowl.js code controls Sage Cells within knowls</xsl:comment>
         <script>
             <!-- button text, internationalized -->
@@ -13865,10 +13863,7 @@ TODO:
 <xsl:template name="pretext-js">
     <xsl:choose>
         <xsl:when test="not($b-debug-react)">
-            <!-- condition first on toc present? -->
-            <script src="{$html.js.dir}/jquery.min.js"></script>
-            <script src="{$html.js.dir}/pretext.js"></script>
-            <script src="{$html.js.dir}/pretext_add_on.js?x=1"></script>
+            <script src="{$html.js.dir}/dist/pretext-core.js"></script>
         </xsl:when>
         <xsl:when test="$b-debug-react-local">
             <script type="module" defer="" src="./static/js/main.js"></script>

From 0aae07a8a35bcd0482b5db42313c71e90d33e331 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:19:19 -0600
Subject: [PATCH 08/12] Exclude js/src/ from deployed JS copy (Phase 6)

Update copy_html_js() to exclude the js/src/ directory when copying
JS files to the build output. Only the pre-built bundles in js/dist/
are needed at runtime; the ES module source files are development-only.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 pretext/lib/pretext.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pretext/lib/pretext.py b/pretext/lib/pretext.py
index efe28259a..01bddead0 100644
--- a/pretext/lib/pretext.py
+++ b/pretext/lib/pretext.py
@@ -6019,13 +6019,15 @@ def copy_managed_directories(build_dir, external_abs=None, generated_abs=None, d
 
 
 def copy_html_js(work_dir):
-    '''Copy all necessary CSS and JS into working directory'''
+    '''Copy all necessary JS into working directory'''
 
     # Place support files where expected.
     # We are not careful about placing only modules that are needed, all are copied.
+    # Exclude js/src/ (ES module sources) since only the built bundles in js/dist/
+    # are needed at runtime.
     js_src = os.path.join(get_ptx_path(), "js")
     js_dest = os.path.join(work_dir, "_static", "pretext", "js")
-    shutil.copytree(js_src, js_dest)
+    shutil.copytree(js_src, js_dest, ignore=shutil.ignore_patterns("src"))
 
 
 def copy_build_directory(build_dir, dest_dir):

From 37f3548bdfe5862023f4f7353127390fe0f1210a Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:20:04 -0600
Subject: [PATCH 09/12] Mark all plan phases complete

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 script/jsbuilder/PLAN.md | 88 ++++++++++++++++++++--------------------
 1 file changed, 44 insertions(+), 44 deletions(-)

diff --git a/script/jsbuilder/PLAN.md b/script/jsbuilder/PLAN.md
index 02ffec00b..19682efa0 100644
--- a/script/jsbuilder/PLAN.md
+++ b/script/jsbuilder/PLAN.md
@@ -135,55 +135,55 @@ script/jsbuilder/                 ← new (this directory)
 
 ## Tasks (in order)
 
-### Phase 1 — Build infrastructure
-- [ ] Create `script/jsbuilder/package.json` (esbuild dep, build/watch scripts)
-- [ ] Create `script/jsbuilder/jsbuilder.mjs` (entry points, output to `js/dist/`)
-- [ ] Create `script/jsbuilder/README.md`
+### Phase 1 — Build infrastructure ✅
+- [x] Create `script/jsbuilder/package.json` (esbuild dep, build/watch scripts)
+- [x] Create `script/jsbuilder/jsbuilder.mjs` (entry points, output to `js/dist/`)
+- [x] Create `script/jsbuilder/README.md`
 
-### Phase 2 — Modularize `pretext_add_on.js`
+### Phase 2 — Modularize `pretext_add_on.js` ✅
 Break the monolith into `js/src/` modules. Remove jQuery (~35 calls, concentrated
 in image-magnify, auto-id, video-magnify, GeoGebra, and keyboard-nav sections).
 Fix known bugs (ENTER/ESC fallthrough, broken `knowl_focus_stack` reference).
 
-- [ ] Create `js/src/permalink.js`
-- [ ] Create `js/src/image-magnify.js` (remove jQuery)
-- [ ] Create `js/src/geogebra.js` (remove jQuery — heaviest: ~9 calls)
-- [ ] Create `js/src/keyboard-nav.js` (remove jQuery, fix ESC/ENTER bug, fix broken knowl_focus_stack ref)
-- [ ] Create `js/src/print-preview/` (9 sub-modules — already jQuery-free)
-- [ ] Create `js/src/theme.js`
-- [ ] Create `js/src/embed.js`
-- [ ] Create `js/src/code-copy.js`
-- [ ] Create `js/src/deprecated/video-magnify.js` (flagged dead)
-- [ ] Create `js/src/deprecated/auto-id.js` (flagged suspicious, remove jQuery)
-- [ ] Create `js/src/deprecated/scrollbar-width.js`
-
-### Phase 3 — Convert existing standalone files to ES modules
-These are already jQuery-free; just add `import`/`export` and clean up globals.
-
-- [ ] `js/pretext.js` (227 lines — TOC, sidebar, hash nav)
-- [ ] `js/knowl.js` (286 lines — knowl open/close)
-- [ ] `js/lti_iframe_resizer.js` (50 lines — LTI message handler)
-- [ ] `js/pretext_search.js` (296 lines — search UI)
-
-### Phase 4 — Bundle entry points + build
-- [ ] Create `js/src/pretext-core-entry.js` — imports + inits all core modules
-- [ ] Create `js/src/pretext-search-entry.js` — imports + inits search
-- [ ] Run `npm run build` in `script/jsbuilder/`
-- [ ] Commit `js/dist/` pre-built files
-- [ ] Delete `js/jquery.min.js`
-
-### Phase 5 — XSL update (`xsl/pretext-html.xsl`)
-- [ ] `pretext-js` template (line ~13869): replace 3 `<script>` tags → 1 loading `dist/pretext-core.js`
-- [ ] Wherever `knowl.js` is loaded: remove standalone tag (now in core bundle)
-- [ ] Wherever `lti_iframe_resizer.js` is loaded: remove standalone tag (now in core bundle)
-- [ ] `native-search-box-js` template (line ~13758): load `dist/pretext-search.js` instead
-- [ ] Keep MathJax loader path `"pretext": "_static/pretext/js"` unchanged
-- [ ] The `$b-debug-react` XSL branch is unrelated — leave untouched
-
-### Phase 6 — Python update (`pretext/lib/pretext.py`)
-- [ ] `copy_html_js()` (line ~6021): uses `shutil.copytree` on entire `js/` dir —
-  verify `js/dist/` is included and `js/src/` can optionally be excluded
-- [ ] Verify `mathjaxknowl3.js`, `pretext-webwork/`, `pretext-stack/`, `diagcess/` still copied
+- [x] Create `js/src/permalink.js`
+- [x] Create `js/src/image-magnify.js` (remove jQuery)
+- [x] Create `js/src/geogebra.js` (remove jQuery — heaviest: ~9 calls)
+- [x] Create `js/src/keyboard-nav.js` (remove jQuery, fix ESC/ENTER bug, fix broken knowl_focus_stack ref)
+- [x] Create `js/src/print-preview/` (9 sub-modules — already jQuery-free)
+- [x] Create `js/src/theme.js`
+- [x] Create `js/src/embed.js`
+- [x] Create `js/src/code-copy.js`
+- [x] Create `js/src/deprecated/video-magnify.js` (flagged dead)
+- [x] Create `js/src/deprecated/auto-id.js` (flagged suspicious, remove jQuery)
+- [x] Create `js/src/deprecated/scrollbar-width.js`
+
+### Phase 3 — Convert existing standalone files to ES modules ✅
+Created ES module versions in `js/src/` (originals left intact for backward compat).
+
+- [x] `js/src/toc.js` (from `js/pretext.js` — TOC, sidebar, hash nav)
+- [x] `js/src/knowl.js` (from `js/knowl.js` — knowl open/close)
+- [x] `js/src/lti-iframe-resizer.js` (from `js/lti_iframe_resizer.js` — LTI message handler)
+- [x] `js/src/search.js` (from `js/pretext_search.js` — search UI)
+
+### Phase 4 — Bundle entry points + build ✅
+- [x] Create `js/src/pretext-core-entry.js` — imports + inits all core modules
+- [x] Create `js/src/pretext-search-entry.js` — imports + inits search
+- [x] Run `npm run build` in `script/jsbuilder/`
+- [x] Commit `js/dist/` pre-built files
+- [x] Delete `js/jquery.min.js`
+
+### Phase 5 — XSL update (`xsl/pretext-html.xsl`) ✅
+- [x] `pretext-js` template: replace 3 `<script>` tags → 1 loading `dist/pretext-core.js`
+- [x] Knowl template: remove standalone `knowl.js` tag (now in core bundle)
+- [x] LTI template: remove standalone `lti_iframe_resizer.js` tag (now in core bundle)
+- [x] `native-search-box-js` template: load `dist/pretext-search.js` instead
+- [x] Keep MathJax loader path `"pretext": "_static/pretext/js"` unchanged
+- [x] The `$b-debug-react` XSL branch is unrelated — left untouched
+
+### Phase 6 — Python update (`pretext/lib/pretext.py`) ✅
+- [x] `copy_html_js()`: exclude `js/src/` from deployed copy via `shutil.ignore_patterns`
+- [x] `js/dist/` included automatically (copytree copies everything not ignored)
+- [x] `mathjaxknowl3.js`, `pretext-webwork/`, `pretext-stack/`, `diagcess/` still copied
 
 ## Notes
 

From 3289f97a8217f03023cd98577a0531d738b21f3f Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 11:52:04 -0600
Subject: [PATCH 10/12] add package-lock

---
 script/jsbuilder/package-lock.json | 663 +++++++++++++++++++++++++++++
 1 file changed, 663 insertions(+)
 create mode 100644 script/jsbuilder/package-lock.json

diff --git a/script/jsbuilder/package-lock.json b/script/jsbuilder/package-lock.json
new file mode 100644
index 000000000..22c6619e5
--- /dev/null
+++ b/script/jsbuilder/package-lock.json
@@ -0,0 +1,663 @@
+{
+  "name": "pretext-jsbuilder",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "pretext-jsbuilder",
+      "version": "1.0.0",
+      "dependencies": {
+        "command-line-args": "^6.0.0",
+        "command-line-usage": "^7.0.3",
+        "esbuild": "^0.25.0"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
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+        "ppc64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.12.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      "license": "MIT",
+      "engines": {
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+    "node_modules/wordwrapjs": {
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+      "license": "MIT",
+      "engines": {
+        "node": ">=12.17"
+      }
+    }
+  }
+}

From 6d657e3f3eb99f21908a979de4b9b77197034ce8 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 12:49:57 -0600
Subject: [PATCH 11/12] Fix isDarkMode and jQuery runtime errors

Expose isDarkMode() and setDarkMode() on window so inline XSL scripts
(mermaid init) can access them from outside the IIFE bundle closure.

Restore jQuery as a local file (upgraded to 3.7.1) for Runestone
compatibility. jQuery is loaded conditionally only when Runestone
JS bundles are present, keeping non-Runestone pages jQuery-free.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 js/dist/pretext-core.js      | 2 ++
 js/dist/pretext-core.js.map  | 4 ++--
 js/jquery.min.js             | 2 ++
 js/src/pretext-core-entry.js | 4 ++++
 xsl/pretext-runestone.xsl    | 4 ++++
 5 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 js/jquery.min.js

diff --git a/js/dist/pretext-core.js b/js/dist/pretext-core.js
index 51d95dcee..1af87ebee 100644
--- a/js/dist/pretext-core.js
+++ b/js/dist/pretext-core.js
@@ -1586,6 +1586,8 @@
 
   // ../../js/src/pretext-core-entry.js
   setDarkMode(isDarkMode());
+  window.isDarkMode = isDarkMode;
+  window.setDarkMode = setDarkMode;
   window.addEventListener("DOMContentLoaded", function() {
     initToc();
     initFocusedToc();
diff --git a/js/dist/pretext-core.js.map b/js/dist/pretext-core.js.map
index 28843c82b..4e1c2fa01 100644
--- a/js/dist/pretext-core.js.map
+++ b/js/dist/pretext-core.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["../src/toc.js", "../src/knowl.js", "../src/lti-iframe-resizer.js", "../src/permalink.js", "../src/image-magnify.js", "../src/deprecated/scrollbar-width.js", "../src/geogebra.js", "../src/keyboard-nav.js", "../src/print-preview/geometry.js", "../src/print-preview/workspace.js", "../src/print-preview/page-breaks.js", "../src/print-preview/pages.js", "../src/print-preview/headers-footers.js", "../src/print-preview/paper-size.js", "../src/print-preview/section-swap.js", "../src/print-preview/solutions.js", "../src/print-preview/index.js", "../src/theme.js", "../src/embed.js", "../src/code-copy.js", "../src/deprecated/auto-id.js", "../src/deprecated/video-magnify.js", "../src/pretext-core-entry.js"],
-  "sourcesContent": ["/**\r\n * TOC, sidebar, and navigation (from pretext.js).\r\n *\r\n * Manages the table-of-contents sidebar: scroll-to-active, toggle\r\n * visibility, auto-collapse, focused/expandable TOC items, and\r\n * hash-based navigation.\r\n */\r\n\r\nfunction getOffsetTop(e) {\r\n    if (!e) return 0;\r\n    return getOffsetTop(e.offsetParent) + e.offsetTop;\r\n}\r\n\r\nfunction scrollTocToActive() {\r\n    let fileNameWHash = window.location.href.split(\"/\").pop();\r\n    let fileName = fileNameWHash.split(\"#\")[0];\r\n\r\n    let tocEntry = document.querySelector(\r\n        '#ptx-toc a[href=\"' + fileName + '\"]'\r\n    );\r\n    if (!tocEntry) return;\r\n\r\n    let tocEntryTop = 0;\r\n    if (fileNameWHash.includes(\"#\")) {\r\n        let tocEntryWHash = document.querySelector(\r\n            '#ptx-toc a[href=\"' + fileNameWHash + '\"]'\r\n        );\r\n        if (tocEntryWHash) {\r\n            tocEntry\r\n                .closest(\"li\")\r\n                .querySelectorAll(\"li\")\r\n                .forEach((li) => {\r\n                    li.classList.remove(\"active\");\r\n                });\r\n            tocEntryWHash.closest(\"li\").classList.add(\"active\");\r\n            tocEntryTop = getOffsetTop(tocEntryWHash);\r\n        }\r\n    }\r\n    if (!tocEntryTop) {\r\n        tocEntryTop = getOffsetTop(tocEntry);\r\n    }\r\n\r\n    tocEntry.closest(\"li\").classList.add(\"active\");\r\n    let toc = document.querySelector(\"#ptx-toc\");\r\n    let tocTop = getOffsetTop(toc);\r\n    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;\r\n}\r\n\r\nfunction toggletoc() {\r\n    const thesidebar = document.getElementById(\"ptx-sidebar\");\r\n    if (\r\n        thesidebar.classList.contains(\"hidden\") ||\r\n        thesidebar.classList.contains(\"visible\")\r\n    ) {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else if (thesidebar.offsetParent === null) {\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n    }\r\n    scrollTocToActive();\r\n}\r\n\r\nfunction samePageLink(a) {\r\n    if (!(a instanceof HTMLAnchorElement)) return false;\r\n    try {\r\n        const linkUrl = new URL(a.href, document.baseURI);\r\n        const currentUrl = new URL(window.location.href);\r\n        const sameDocument =\r\n            linkUrl.origin === currentUrl.origin &&\r\n            linkUrl.pathname === currentUrl.pathname &&\r\n            linkUrl.search === currentUrl.search;\r\n        return sameDocument && !!linkUrl.hash;\r\n    } catch (e) {\r\n        return false;\r\n    }\r\n}\r\n\r\nfunction getTOCItemType(item) {\r\n    for (let className of item.classList) {\r\n        if (\r\n            className !== \"toc-item\" &&\r\n            className.length > 3 &&\r\n            className.slice(0, 4) === \"toc-\"\r\n        )\r\n            return className.slice(4);\r\n    }\r\n    return \"\";\r\n}\r\n\r\nfunction getTOCItemDepth(item) {\r\n    let depth = 0;\r\n    let curParent = item.closest(\".toc-item-list\");\r\n    while (curParent !== null) {\r\n        depth++;\r\n        curParent = curParent.parentElement.closest(\".toc-item-list\");\r\n    }\r\n    return depth;\r\n}\r\n\r\nfunction toggleTOCItem(expander) {\r\n    let listItem = expander.closest(\".toc-item\");\r\n    listItem.classList.toggle(\"expanded\");\r\n    let expanded = listItem.classList.contains(\"expanded\");\r\n    let itemType = getTOCItemType(listItem);\r\n\r\n    if (expanded) {\r\n        expander.title = \"Close\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    } else {\r\n        expander.title = \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    }\r\n\r\n    for (const childUL of listItem.querySelectorAll(\r\n        \":scope > ul.toc-item-list\"\r\n    )) {\r\n        for (const childItem of childUL.querySelectorAll(\r\n            \":scope > li.toc-item\"\r\n        )) {\r\n            if (expanded) {\r\n                childItem.classList.add(\"visible\");\r\n                childItem.classList.remove(\"hidden\");\r\n            } else {\r\n                childItem.classList.remove(\"visible\");\r\n                childItem.classList.add(\"hidden\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initToc() {\r\n    const thetocbutton = document.getElementsByClassName(\"toc-toggle\")[0];\r\n    if (thetocbutton) {\r\n        thetocbutton.addEventListener(\"click\", (e) => {\r\n            toggletoc();\r\n            e.stopPropagation();\r\n        });\r\n    }\r\n\r\n    // Auto-collapse TOC when clicking outside\r\n    if (\r\n        getComputedStyle(document.documentElement).getPropertyValue(\r\n            \"--auto-collapse-toc\"\r\n        ) == \"yes\"\r\n    ) {\r\n        const sidebar = document.getElementById(\"ptx-sidebar\");\r\n\r\n        window.addEventListener(\"click\", function (event) {\r\n            if (sidebar.classList.contains(\"visible\")) {\r\n                if (!event.composedPath().includes(sidebar)) {\r\n                    toggletoc();\r\n                }\r\n            }\r\n        });\r\n\r\n        sidebar.addEventListener(\"click\", function (event) {\r\n            if (samePageLink(event.target.closest(\"a\"))) {\r\n                toggletoc();\r\n            }\r\n        });\r\n\r\n        window.addEventListener(\"pageshow\", (e) => {\r\n            if (e.persisted) {\r\n                sidebar.classList.remove(\"visible\");\r\n                sidebar.classList.add(\"hidden\");\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initFocusedToc() {\r\n    if (document.querySelector(\".ptx-toc.focused\") === null) return;\r\n\r\n    let maxDepth = 1000;\r\n    for (let className of document.querySelector(\".ptx-toc\").classList)\r\n        if (className.length > 5 && className.slice(0, 5) === \"depth\")\r\n            maxDepth = Number(className.slice(5));\r\n\r\n    let preexpandedLevels = 1;\r\n    let tocDataSet = document.querySelector(\".ptx-toc\").dataset;\r\n    if (typeof tocDataSet.preexpandedLevels !== \"undefined\")\r\n        preexpandedLevels = Number(tocDataSet.preexpandedLevels);\r\n\r\n    let tocItems = document.querySelectorAll(\r\n        \".ptx-toc ul.structural > .toc-item\"\r\n    );\r\n    for (const tocItem of tocItems) {\r\n        let hasChildren =\r\n            tocItem.querySelector(\"ul.structural\") !== null;\r\n        let depth = getTOCItemDepth(tocItem);\r\n\r\n        if (hasChildren && depth < maxDepth) {\r\n            let expander = document.createElement(\"button\");\r\n            expander.classList.add(\"toc-expander\");\r\n            expander.classList.add(\"toc-chevron-surround\");\r\n            expander.title = \"toc-expander\";\r\n            expander.innerHTML =\r\n                '<span class=\"icon material-symbols-outlined\" aria-hidden=\"true\"></span>';\r\n            tocItem.querySelector(\".toc-title-box\").append(expander);\r\n            expander.addEventListener(\"click\", () => {\r\n                toggleTOCItem(expander);\r\n            });\r\n\r\n            let isActive =\r\n                tocItem.classList.contains(\"contains-active\") ||\r\n                tocItem.classList.contains(\"active\");\r\n            let preExpanded = isActive || depth < preexpandedLevels;\r\n            let itemType = getTOCItemType(tocItem);\r\n            if (preExpanded) {\r\n                toggleTOCItem(expander);\r\n            } else {\r\n                expander.title =\r\n                    \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n            }\r\n        }\r\n    }\r\n\r\n    // Expand parents of hash-linked TOC item\r\n    if (window.location.hash) {\r\n        let hash = window.location.hash;\r\n        let hashLink = document.querySelector(\r\n            `.ptx-toc a[href$=\"${hash}\"]`\r\n        );\r\n        if (hashLink) {\r\n            let parentTocItem = hashLink.closest(\".toc-item\");\r\n            while (\r\n                parentTocItem &&\r\n                !parentTocItem.classList.contains(\"contains-active\")\r\n            ) {\r\n                parentTocItem.classList.add(\"contains-active\");\r\n                let expander =\r\n                    parentTocItem.querySelector(\".toc-expander\");\r\n                if (expander) {\r\n                    if (!parentTocItem.classList.contains(\"expanded\")) {\r\n                        toggleTOCItem(expander);\r\n                    }\r\n                }\r\n                parentTocItem =\r\n                    parentTocItem.parentElement.closest(\".toc-item\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initScrollToc() {\r\n    scrollTocToActive();\r\n    window.onhashchange = scrollTocToActive;\r\n}\r\n", "/**\r\n * Knowl behavior (from knowl.js).\r\n *\r\n * Manages xref knowls and born-hidden knowls: click-to-reveal with\r\n * slide animation, lazy content fetching, and MathJax re-typesetting.\r\n */\r\n\r\n// Used to animate both types of knowls\r\nclass SlideRevealer {\r\n    static STATE = Object.freeze({\r\n        INACTIVE: 0,\r\n        CLOSING: 1,\r\n        EXPANDING: 2,\r\n    });\r\n\r\n    constructor(triggerElement, contentElement, animatedElement) {\r\n        this.triggerElement = triggerElement;\r\n        this.contentElement = contentElement;\r\n        this.animatedElement = animatedElement;\r\n\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        this.triggerElement.addEventListener(\"click\", (e) => this.onClick(e));\r\n    }\r\n\r\n    onClick(e) {\r\n        if (e) e.preventDefault();\r\n        this.animatedElement.style.overflow = \"hidden\";\r\n\r\n        if (\r\n            this.animationState === SlideRevealer.STATE.CLOSING ||\r\n            !this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.animatedElement.setAttribute(\"open\", \"\");\r\n            this.triggerElement.setAttribute(\"open\", \"\");\r\n            this.contentElement.style.display = \"\";\r\n            MathJax.typesetPromise().then(() =>\r\n                window.requestAnimationFrame(() => this.toggle(true))\r\n            );\r\n        } else if (\r\n            this.animationState === SlideRevealer.STATE.EXPANDING ||\r\n            this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.toggle(false);\r\n        }\r\n    }\r\n\r\n    toggle(expanding) {\r\n        let closedHeight = 0;\r\n        if (this.animatedElement.contains(this.triggerElement))\r\n            closedHeight = this.triggerElement.offsetHeight;\r\n        const fullHeight = closedHeight + this.contentElement.offsetHeight;\r\n\r\n        const startHeight = `${expanding ? closedHeight : fullHeight}px`;\r\n        const endHeight = `${expanding ? fullHeight : closedHeight}px`;\r\n\r\n        const padding =\r\n            this.animatedElement.offsetHeight -\r\n            this.animatedElement.clientHeight;\r\n        const startPad = `${expanding ? 0 : padding}px`;\r\n        const endPad = `${expanding ? padding : 0}px`;\r\n\r\n        if (this.animation) this.animation.cancel();\r\n\r\n        const animDuration = Math.max(\r\n            Math.min(\r\n                (Math.abs(closedHeight - fullHeight) / 400) * 1000,\r\n                750\r\n            ),\r\n            250\r\n        );\r\n\r\n        this.animationState = expanding\r\n            ? SlideRevealer.STATE.EXPANDING\r\n            : SlideRevealer.STATE.CLOSING;\r\n        this.animation = this.animatedElement.animate(\r\n            {\r\n                height: [startHeight, endHeight],\r\n                paddingTop: [startPad, endPad],\r\n                paddingBottom: [startPad, endPad],\r\n            },\r\n            { duration: animDuration, easing: \"ease\" }\r\n        );\r\n\r\n        this.animation.onfinish = () => {\r\n            this.onAnimationFinish(expanding);\r\n        };\r\n        this.animation.oncancel = () => {\r\n            this.animationState = SlideRevealer.STATE.INACTIVE;\r\n        };\r\n    }\r\n\r\n    onAnimationFinish(isOpen) {\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        if (!isOpen) {\r\n            this.animatedElement.removeAttribute(\"open\");\r\n            this.triggerElement.removeAttribute(\"open\");\r\n        }\r\n\r\n        this.animatedElement.style.overflow = \"\";\r\n        if (!isOpen) this.contentElement.style.display = \"none\";\r\n\r\n        if (isOpen) {\r\n            let hasCallback =\r\n                this.contentElement.querySelectorAll(\r\n                    \"[data-knowl-callback]\"\r\n                );\r\n            hasCallback.forEach((el) => {\r\n                window[el.getAttribute(\"data-knowl-callback\")](el, open);\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nclass LinkKnowl {\r\n    static xrefCount = 0;\r\n\r\n    static initializeXrefKnowl(knowlLinkElement) {\r\n        if (\r\n            knowlLinkElement.getAttribute(\"data-knowl-uid\") === null\r\n        ) {\r\n            return new LinkKnowl(knowlLinkElement);\r\n        }\r\n    }\r\n\r\n    constructor(knowlLinkElement) {\r\n        this.linkElement = knowlLinkElement;\r\n        this.outputElement = null;\r\n        this.uid = LinkKnowl.xrefCount++;\r\n        knowlLinkElement.setAttribute(\"data-knowl-uid\", this.uid);\r\n        knowlLinkElement.setAttribute(\"role\", \"button\");\r\n        knowlLinkElement.setAttribute(\r\n            \"data-base-title\",\r\n            knowlLinkElement.getAttribute(\"title\") ||\r\n                this.linkElement.textContent\r\n        );\r\n        knowlLinkElement.classList.add(\"knowl__link\");\r\n        this.updateLabels(false);\r\n        knowlLinkElement.addEventListener(\r\n            \"click\",\r\n            this.handleLinkClick.bind(this)\r\n        );\r\n    }\r\n\r\n    updateLabels(isVisible) {\r\n        const verb = isVisible\r\n            ? this.linkElement.getAttribute(\"data-close-label\") || \"Close\"\r\n            : this.linkElement.getAttribute(\"data-reveal-label\") ||\r\n              \"Reveal\";\r\n        const targetDescript =\r\n            this.linkElement.getAttribute(\"data-base-title\");\r\n        const helpText = verb + \" \" + targetDescript;\r\n        this.linkElement.setAttribute(\"aria-label\", helpText);\r\n        this.linkElement.setAttribute(\"title\", helpText);\r\n    }\r\n\r\n    toggle() {\r\n        this.linkElement.classList.toggle(\"active\");\r\n        const isActive = this.linkElement.classList.contains(\"active\");\r\n        this.updateLabels(isActive);\r\n\r\n        if (isActive) {\r\n            const h = this.outputElement.getBoundingClientRect().height;\r\n            if (h > window.innerHeight) {\r\n                this.outputElement.scrollIntoView(true);\r\n            } else {\r\n                if (\r\n                    this.outputElement.getBoundingClientRect().bottom >\r\n                    window.innerHeight\r\n                )\r\n                    this.outputElement.scrollIntoView(false);\r\n            }\r\n        }\r\n    }\r\n\r\n    findOutputLocation() {\r\n        const invalidParents =\r\n            \"table, mjx-container, div.tabular-box, .runestone > .parsons\";\r\n        let el = this.linkElement.parentElement;\r\n        let problemAncestor = el.closest(invalidParents);\r\n        while (problemAncestor && problemAncestor !== el) {\r\n            el = problemAncestor;\r\n            problemAncestor = el.closest(invalidParents);\r\n        }\r\n        return el;\r\n    }\r\n\r\n    createOutputElement() {\r\n        const outputId = \"knowl-uid-\" + this.uid;\r\n        const outputContentsId = \"knowl-output-\" + this.uid;\r\n        const linkTarget =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n\r\n        const placeholderText =\r\n            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +\r\n            `Loading '${linkTarget}'` +\r\n            `</div>`;\r\n\r\n        const temp = document.createElement(\"template\");\r\n        temp.innerHTML = placeholderText;\r\n        this.outputElement = temp.content.children[0];\r\n\r\n        const insertLoc = this.findOutputLocation(this.linkElement);\r\n        insertLoc.after(this.outputElement);\r\n    }\r\n\r\n    async getContent() {\r\n        const contentURL =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n        const knowlContent = await fetch(contentURL)\r\n            .then((response) => response.text())\r\n            .then((data) => {\r\n                let knowlDoc = new DOMParser().parseFromString(\r\n                    data,\r\n                    \"text/html\"\r\n                );\r\n                let tempContainer = knowlDoc.body;\r\n                let scripts = knowlDoc.querySelectorAll(\"head script\");\r\n                tempContainer.append(...scripts);\r\n                return tempContainer;\r\n            })\r\n            .catch((error) => {\r\n                const destination =\r\n                    this.linkElement.getAttribute(\"href\");\r\n                const text = this.linkElement.textContent;\r\n                const err_message =\r\n                    `<div class='knowl-output__error'>` +\r\n                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +\r\n                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +\r\n                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href=\"https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally\">PreTeXt FAQ</a> for more information.</div>` +\r\n                    `</div>`;\r\n                return err_message;\r\n            });\r\n        return knowlContent;\r\n    }\r\n\r\n    handleLinkClick(event) {\r\n        event.preventDefault();\r\n\r\n        if (this.outputElement !== null) {\r\n            this.toggle();\r\n        } else {\r\n            this.createOutputElement();\r\n\r\n            const slideHandler = new SlideRevealer(\r\n                this.linkElement,\r\n                this.outputElement,\r\n                this.outputElement\r\n            );\r\n            this.linkElement.addEventListener(\"click\", slideHandler);\r\n\r\n            let loadingTimeout = setTimeout(() => {\r\n                loadingTimeout = null;\r\n                slideHandler.onClick();\r\n                this.toggle();\r\n            }, 500);\r\n\r\n            const content = this.getContent();\r\n\r\n            content\r\n                .then((tempContainer) => {\r\n                    if (loadingTimeout !== null) {\r\n                        clearTimeout(loadingTimeout);\r\n                    }\r\n                    setTimeout(() => {\r\n                        slideHandler.onClick();\r\n                        this.toggle();\r\n                    }, 100);\r\n\r\n                    const runestoneElements =\r\n                        tempContainer.querySelectorAll(\r\n                            \".ptx-runestone-container\"\r\n                        );\r\n                    [...runestoneElements].forEach((e) => {\r\n                        const rsId =\r\n                            e.querySelector(\"[data-component]\")?.id;\r\n                        const onPage = document.getElementById(rsId);\r\n                        if (onPage) {\r\n                            e.innerHTML = `<div class=\"para\">The interactive that belongs here is already on the page and cannot appear multiple times. <a href=\"#${rsId}\">Scroll to interactive.</a>`;\r\n                        } else {\r\n                            window.runestoneComponents.renderOneComponent(\r\n                                e\r\n                            );\r\n                        }\r\n                    });\r\n\r\n                    const children = [...tempContainer.children];\r\n                    this.outputElement.innerHTML = \"\";\r\n                    this.outputElement.append(...children);\r\n\r\n                    addKnowls(this.outputElement);\r\n                    Prism.highlightAllUnder(this.outputElement);\r\n\r\n                    [\r\n                        ...this.outputElement.getElementsByTagName(\r\n                            \"script\"\r\n                        ),\r\n                    ].forEach((s) => {\r\n                        if (\r\n                            s.getAttribute(\"type\") === null ||\r\n                            s.getAttribute(\"type\") ===\r\n                                \"text/javascript\"\r\n                        ) {\r\n                            eval(s.innerHTML);\r\n                        }\r\n                    });\r\n                })\r\n                .catch((data) => {\r\n                    console.log(\r\n                        \"Error fetching knowl content: \" + data\r\n                    );\r\n                });\r\n        }\r\n    }\r\n}\r\n\r\nexport function addKnowls(target) {\r\n    const xrefs = target.querySelectorAll(\"[data-knowl]\");\r\n    for (const xref of xrefs) {\r\n        LinkKnowl.initializeXrefKnowl(xref);\r\n    }\r\n\r\n    const bornHiddens = target.querySelectorAll(\".born-hidden-knowl\");\r\n    for (const bhk of bornHiddens) {\r\n        const summary = bhk.querySelector(\":scope > summary\");\r\n        const contents = bhk.querySelector(\":scope > summary + *\");\r\n        new SlideRevealer(summary, contents, bhk);\r\n    }\r\n}\r\n\r\nexport function initKnowls() {\r\n    addKnowls(document);\r\n}\r\n", "/**\r\n * LTI iframe resizer (from lti_iframe_resizer.js).\r\n *\r\n * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),\r\n * adjusting iframe dimensions based on postMessage events.\r\n *\r\n * @see https://cssplice.org/\r\n */\r\n\r\nexport function sendResizeRequest(el) {\r\n    el.contentWindow.postMessage(\"requestResize\", \"*\");\r\n}\r\n\r\nexport function initLtiIframeResizer() {\r\n    window.addEventListener(\"message\", function (event) {\r\n        let edata = event.data;\r\n\r\n        // MoM sends event.data as a string instead of JSON\r\n        if (\r\n            typeof event.data == \"string\" &&\r\n            event.data.match(/lti\\.frameResize/)\r\n        ) {\r\n            edata = JSON.parse(event.data);\r\n        }\r\n\r\n        if (edata.subject === \"lti.frameResize\") {\r\n            if (\"frame_id\" in edata) {\r\n                const el = document.getElementById(edata[\"frame_id\"]);\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n                if (\r\n                    edata.wrapheight &&\r\n                    document.getElementById(edata[\"frame_id\"] + \"wrap\")\r\n                ) {\r\n                    document.getElementById(\r\n                        edata[\"frame_id\"] + \"wrap\"\r\n                    ).style.height = edata.wrapheight + \"px\";\r\n                }\r\n            } else if (\"iframe_resize_id\" in edata) {\r\n                const el = document.getElementById(\r\n                    edata[\"iframe_resize_id\"]\r\n                );\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n            } else {\r\n                const iFrames =\r\n                    document.getElementsByTagName(\"iframe\");\r\n                for (const iFrame of iFrames) {\r\n                    if (iFrame.contentWindow === event.source) {\r\n                        if (edata.height) {\r\n                            iFrame.height = edata.height;\r\n                            iFrame.style.height = edata.height + \"px\";\r\n                        }\r\n                        if (edata.width) {\r\n                            iFrame.width = edata.width;\r\n                            iFrame.style.width = edata.width + \"px\";\r\n                        }\r\n                        break;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Permalink copy-to-clipboard functionality.\r\n *\r\n * Copies permalink URLs to the clipboard using the Clipboard API,\r\n * with a brief visual confirmation message.\r\n */\r\n\r\nasync function copyPermalink(linkNode) {\r\n    if (!navigator.clipboard) {\r\n        console.log(\"Error: Clipboard API not available\");\r\n        return;\r\n    }\r\n    const elem = linkNode.parentElement;\r\n    if (!linkNode) {\r\n        console.log(\"Error: Something went wrong finding permalink URL\");\r\n        return;\r\n    }\r\n    const url = linkNode.href;\r\n    const description = elem.getAttribute(\"data-description\");\r\n    const link = `<a href=\"${url}\">${description}</a>`;\r\n    const msgLink = `<a class=\"internal\" href=\"${url}\">${description}</a>`;\r\n    const textFallback = description + \" \\r\\n\" + url;\r\n    let copySuccess = true;\r\n\r\n    try {\r\n        // NOTE: this method will only work in Firefox if the user has\r\n        //    dom.events.asyncClipboard.clipboardItem\r\n        // set to true in their about:config.\r\n        await navigator.clipboard.write([\r\n            new ClipboardItem({\r\n                \"text/html\": new Blob([link], { type: \"text/html\" }),\r\n                \"text/plain\": new Blob([textFallback], { type: \"text/plain\" }),\r\n            }),\r\n        ]);\r\n    } catch (err) {\r\n        console.log(\r\n            \"Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText\",\r\n            err\r\n        );\r\n        copySuccess = false;\r\n    }\r\n\r\n    if (!copySuccess) {\r\n        try {\r\n            await navigator.clipboard.writeText(textFallback);\r\n        } catch (err) {\r\n            console.log(\r\n                \"Permalink-to-clipboard using clipboard.writeText failed\",\r\n                err\r\n            );\r\n            console.error(\"Failed to copy link to clipboard!\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    console.log(`copied '${url}' to clipboard`);\r\n    const copiedMsg = document.createElement(\"p\");\r\n    copiedMsg.setAttribute(\"role\", \"alert\");\r\n    copiedMsg.className = \"permalink-alert\";\r\n    copiedMsg.innerHTML = \"Link to \" + msgLink + \" copied to clipboard\";\r\n    elem.parentElement.insertBefore(copiedMsg, elem);\r\n    await new Promise((resolve) => setTimeout(resolve, 1500));\r\n    copiedMsg.remove();\r\n}\r\n\r\nexport function initPermalinks() {\r\n    const permalinks = document.querySelectorAll(\".autopermalink > a\");\r\n    permalinks.forEach((link) => {\r\n        link.addEventListener(\"click\", function (event) {\r\n            event.preventDefault();\r\n            copyPermalink(link);\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Image magnification (click-to-zoom).\r\n *\r\n * Clicking an eligible image creates a full-width popup; clicking the\r\n * popup dismisses it.  Uses event delegation on the document body.\r\n */\r\n\r\n/**\r\n * Walk up from `el` through ancestors, collecting those that match `selector`.\r\n * Returns the *last* (outermost) match \u2014 equivalent to jQuery's\r\n * `.parents(selector).last()`.\r\n */\r\nfunction outermostMatchingAncestor(el, selector) {\r\n    let match = null;\r\n    let current = el.parentElement;\r\n    while (current) {\r\n        if (current.matches(selector)) {\r\n            match = current;\r\n        }\r\n        current = current.parentElement;\r\n    }\r\n    return match;\r\n}\r\n\r\nexport function initImageMagnify() {\r\n    const imgSelector =\r\n        \".image-box > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \".sbspanel > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > div > img:not(.draw_on_me):not(.mag_popup)\";\r\n\r\n    // Click an image to magnify\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const img = event.target.closest(imgSelector);\r\n        if (!img) return;\r\n\r\n        const container = document.createElement(\"div\");\r\n        container.setAttribute(\"style\", \"background:#fff;\");\r\n        container.setAttribute(\"class\", \"mag_popup_container\");\r\n        container.innerHTML =\r\n            '<img src=\"' +\r\n            img.src +\r\n            '\" style=\"width:100%\" class=\"mag_popup\"/>';\r\n\r\n        let placement = outermostMatchingAncestor(\r\n            img,\r\n            \".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)\"\r\n        );\r\n\r\n        // For .cols2, even articles go inside the previous odd one\r\n        if (placement && placement.tagName === \"ARTICLE\") {\r\n            const prev = placement.previousElementSibling;\r\n            if (prev) {\r\n                placement = prev.firstElementChild || prev;\r\n            }\r\n        }\r\n\r\n        if (placement) {\r\n            placement.parentNode.insertBefore(container, placement);\r\n        }\r\n    });\r\n\r\n    // Click the big image to dismiss it\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        if (event.target.classList.contains(\"mag_popup\")) {\r\n            event.target.parentNode.remove();\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Scrollbar width detection utility.\r\n *\r\n * \u26A0\uFE0F DEPRECATED: Only used by the GeoGebra calculator integration.\r\n * Consider replacing with a CSS-based approach in the future.\r\n *\r\n * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript\r\n */\r\n\r\nexport function getScrollbarWidth() {\r\n    const outer = document.createElement(\"div\");\r\n    outer.style.visibility = \"hidden\";\r\n    outer.style.width = \"100px\";\r\n    outer.style.msOverflowStyle = \"scrollbar\"; // needed for WinJS apps\r\n\r\n    document.body.appendChild(outer);\r\n\r\n    const widthNoScroll = outer.offsetWidth;\r\n    outer.style.overflow = \"scroll\";\r\n\r\n    const inner = document.createElement(\"div\");\r\n    inner.style.width = \"100%\";\r\n    outer.appendChild(inner);\r\n\r\n    const widthWithScroll = inner.offsetWidth;\r\n    outer.parentNode.removeChild(outer);\r\n\r\n    return widthNoScroll - widthWithScroll;\r\n}\r\n", "/**\r\n * GeoGebra calculator integration.\r\n *\r\n * Manages the floating GeoGebra calculator overlay: toggling visibility,\r\n * preventing body scroll while hovering the canvas, and injecting the\r\n * GeoGebra applet script on first open.\r\n */\r\n\r\nimport { getScrollbarWidth } from \"./deprecated/scrollbar-width.js\";\r\n\r\nfunction calculatorOnload() {\r\n    const toggle = document.getElementById(\"calculator-toggle\");\r\n    if (toggle) toggle.focus();\r\n    const inputField = document.querySelector(\r\n        \"input.gwt-SuggestBox.TextField\"\r\n    );\r\n    if (inputField) inputField.focus();\r\n}\r\n\r\nexport function initGeoGebra() {\r\n    const scrollWidth = getScrollbarWidth();\r\n    const calcOffsetR = 5;\r\n    const calcOffsetB = 5;\r\n\r\n    // Prevent body scroll when hovering the GeoGebra canvas\r\n    document.body.addEventListener(\"mouseover\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"hidden\";\r\n        document.documentElement.style.marginRight = \"15px\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + scrollWidth + \"px\";\r\n            container.style.bottom = calcOffsetB + scrollWidth + \"px\";\r\n        }\r\n    });\r\n\r\n    document.body.addEventListener(\"mouseout\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"scroll\";\r\n        document.documentElement.style.marginRight = \"0\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + \"px\";\r\n            container.style.bottom = calcOffsetB + \"px\";\r\n        }\r\n    });\r\n\r\n    // Toggle calculator visibility\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const toggle = event.target.closest(\"#calculator-toggle\");\r\n        if (!toggle) return;\r\n\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (!container) return;\r\n\r\n        if (container.style.display === \"none\" || !container.style.display) {\r\n            container.style.display = \"block\";\r\n            toggle.classList.add(\"open\");\r\n            toggle.setAttribute(\"title\", \"Hide calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"true\");\r\n\r\n            const existingScript = document.getElementById(\"create_ggb_calc\");\r\n            if (!existingScript) {\r\n                const ggbScript = document.createElement(\"script\");\r\n                ggbScript.id = \"create_ggb_calc\";\r\n                ggbScript.innerHTML = \"ggbApp.inject('geogebra-calculator')\";\r\n                document.body.appendChild(ggbScript);\r\n            } else {\r\n                calculatorOnload();\r\n            }\r\n        } else {\r\n            container.style.display = \"none\";\r\n            toggle.classList.remove(\"open\");\r\n            toggle.setAttribute(\"title\", \"Show calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"false\");\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Keyboard navigation handlers.\r\n *\r\n * - ENTER in a `.workspace` triggers MathJax typesetting.\r\n * - ESC navigates back through Sage cell focus, then up the knowl stack,\r\n *   or does nothing if no interactive context is active.\r\n * - Hash-based anchor navigation: opens knowls linked via URL hash.\r\n */\r\n\r\nlet justHitEscape = false;\r\n\r\nfunction processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n\r\nexport function initKeyboardNav() {\r\n    document.onkeyup = function (event) {\r\n        const e = event || window.event;\r\n        switch (e.keyCode) {\r\n            case 13: // ENTER\r\n                justHitEscape = false;\r\n                if (\r\n                    document.activeElement.classList.contains(\"workspace\")\r\n                ) {\r\n                    processWorkspace();\r\n                }\r\n                break; // Fixed: was missing, caused fallthrough to ESC handler\r\n\r\n            case 27: // ESC\r\n            {\r\n                const parentSageCell =\r\n                    document.activeElement.closest(\".sagecell_editor\");\r\n                if (parentSageCell && !justHitEscape) {\r\n                    justHitEscape = true;\r\n                    setTimeout(function () {\r\n                        justHitEscape = false;\r\n                    }, 1000);\r\n                }\r\n                // knowl_focus_stack is defined in knowl.js and may not exist\r\n                // in all contexts \u2014 guard against ReferenceError\r\n                else if (\r\n                    typeof knowl_focus_stack !== \"undefined\" &&\r\n                    knowl_focus_stack.length > 0\r\n                ) {\r\n                    const mostRecentlyOpened = knowl_focus_stack.pop();\r\n                    if (typeof knowl_focus_stack_uid !== \"undefined\") {\r\n                        knowl_focus_stack_uid.pop();\r\n                    }\r\n                    mostRecentlyOpened.focus();\r\n                } else {\r\n                    break;\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    };\r\n}\r\n\r\nexport function initAnchorKnowl() {\r\n    if (!window.location.hash.length) return;\r\n\r\n    const id = window.location.hash.substring(1);\r\n    const anchor = document.getElementById(id);\r\n    if (!anchor) return;\r\n\r\n    if (anchor.tagName === \"ARTICLE\") {\r\n        const containedKnowl = anchor.querySelector(\"a[data-knowl]\");\r\n        if (containedKnowl && containedKnowl.parentElement === anchor) {\r\n            containedKnowl.click();\r\n        }\r\n    } else if (anchor.hasAttribute(\"data-knowl\")) {\r\n        anchor.click();\r\n    } else {\r\n        // If it is a hidden knowl, find the knowl and open it\r\n        const hiddenContent = anchor.closest(\".hidden-content\");\r\n        if (hiddenContent) {\r\n            const refId = hiddenContent.id;\r\n            const knowl = document.querySelector(\r\n                '[data-refid=\"' + refId + '\"]'\r\n            );\r\n            if (knowl) knowl.click();\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview page geometry helpers.\r\n *\r\n * Utilities for converting CSS units to pixels, computing element heights,\r\n * and injecting dynamic @page / CSS-variable rules.\r\n */\r\n\r\nexport function toPixels(value) {\r\n    if (typeof value === \"number\") return value;\r\n    if (typeof value !== \"string\") return 0;\r\n    value = value.trim();\r\n    if (value.endsWith(\"px\")) {\r\n        return parseFloat(value);\r\n    } else if (value.endsWith(\"in\")) {\r\n        return Math.floor(parseFloat(value) * 96);\r\n    } else if (value.endsWith(\"cm\")) {\r\n        return Math.floor(parseFloat(value) * 37.8);\r\n    } else if (value.endsWith(\"mm\")) {\r\n        return Math.floor(parseFloat(value) * 3.78);\r\n    } else if (value.endsWith(\"pt\")) {\r\n        return Math.floor(parseFloat(value) * (96 / 72));\r\n    } else {\r\n        return parseFloat(value) || 0;\r\n    }\r\n}\r\n\r\nexport function getElementTotalHeight(elem) {\r\n    const style = getComputedStyle(elem);\r\n    const marginTop = parseFloat(style.marginTop);\r\n    const marginBottom = parseFloat(style.marginBottom);\r\n    const height = elem.offsetHeight;\r\n    return height + marginTop + marginBottom;\r\n}\r\n\r\nexport function getElemWorkspaceHeight(elem) {\r\n    if (elem.classList.contains(\"sidebyside\")) {\r\n        const sbspanels = elem.querySelectorAll(\".sbspanel\");\r\n        let max = 0;\r\n        sbspanels.forEach((panel) => {\r\n            const workspaces = panel.querySelectorAll(\".workspace\");\r\n            let totalHeight = 0;\r\n            workspaces.forEach((workspace) => {\r\n                const workspaceHeight = workspace.offsetHeight;\r\n                if (workspaceHeight) {\r\n                    totalHeight += workspaceHeight;\r\n                }\r\n            });\r\n            if (totalHeight > max) {\r\n                max = totalHeight;\r\n            }\r\n        });\r\n        return max;\r\n    }\r\n\r\n    let columns = 1;\r\n    if (elem.classList.contains(\"exercisegroup\")) {\r\n        for (let i = 2; i <= 6; i++) {\r\n            if (elem.querySelector(`.cols${i}`)) {\r\n                columns = i;\r\n                break;\r\n            }\r\n        }\r\n    }\r\n    const workspaces = elem.querySelectorAll(\".workspace\");\r\n    let totalHeight = 0;\r\n    workspaces.forEach((ws) => {\r\n        const workspaceHeight = ws.offsetHeight;\r\n        if (workspaceHeight) {\r\n            totalHeight += workspaceHeight;\r\n        }\r\n    });\r\n    return totalHeight / columns;\r\n}\r\n\r\nexport function setPageGeometryCSS({ paperSize, margins }) {\r\n    const existingStyle = document.getElementById(\"page-geometry-css\");\r\n    if (existingStyle) {\r\n        existingStyle.remove();\r\n    }\r\n    const wsWidth = paperSize === \"letter\" ? \"816px\" : \"794px\";\r\n    const wsHeight = paperSize === \"letter\" ? \"1056px\" : \"1123px\";\r\n\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"page-geometry-css\";\r\n    style.textContent = `\r\n        :root {\r\n            --ws-width: ${wsWidth};\r\n            --ws-height: ${wsHeight};\r\n            --ws-top-margin: ${margins.top}px;\r\n            --ws-right-margin: ${margins.right}px;\r\n            --ws-bottom-margin: ${margins.bottom}px;\r\n            --ws-left-margin: ${margins.left}px;\r\n        }\r\n        @page {\r\n            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);\r\n        }\r\n    `;\r\n    document.head.appendChild(style);\r\n}\r\n", "/**\r\n * Print-preview workspace height management.\r\n *\r\n * Handles setting initial workspace heights from data attributes,\r\n * adjusting heights to fit pages, highlighting workspace areas,\r\n * and MathJax re-typesetting on workspace edits.\r\n */\r\n\r\nimport { getElementTotalHeight, getElemWorkspaceHeight } from \"./geometry.js\";\r\n\r\nexport function setInitialWorkspaceHeights() {\r\n    const workspaces = document.querySelectorAll(\".workspace\");\r\n    workspaces.forEach((ws) => {\r\n        ws.style.height = ws.getAttribute(\"data-space\") || \"0px\";\r\n        ws.setAttribute(\"contenteditable\", \"true\");\r\n    });\r\n}\r\n\r\nexport function adjustWorkspaceToFitPage({ paperSize, margins }) {\r\n    // Toggle off workspace highlight if it is on\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(false);\r\n    }\r\n\r\n    let paperWidth, paperHeight;\r\n    if (paperSize === \"a4\" || document.body.classList.contains(\"a4\")) {\r\n        paperWidth = 794;\r\n        paperHeight = 1122.5;\r\n    } else {\r\n        paperWidth = 816;\r\n        paperHeight = 1056;\r\n    }\r\n    const paperContentHeight = paperHeight - (margins.top + margins.bottom);\r\n\r\n    setInitialWorkspaceHeights();\r\n\r\n    const pages = document.querySelectorAll(\".onepage\");\r\n    pages.forEach((page) => {\r\n        page.style.width = paperWidth + \"px\";\r\n        const rows = page.children;\r\n        let totalContentHeight = 0;\r\n        let totalWorkspaceHeight = 0;\r\n        for (const row of rows) {\r\n            totalContentHeight += getElementTotalHeight(row);\r\n            totalWorkspaceHeight += getElemWorkspaceHeight(row);\r\n        }\r\n        if (totalWorkspaceHeight === 0) {\r\n            page.style.width = \"\";\r\n            return;\r\n        }\r\n        const extraHeight = paperContentHeight - totalContentHeight;\r\n        const workspaceAdjustmentFactor =\r\n            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;\r\n        const pageWorkspaces = page.querySelectorAll(\".workspace\");\r\n        pageWorkspaces.forEach((ws) => {\r\n            const originalHeight = ws.offsetHeight;\r\n            const newHeight = originalHeight * workspaceAdjustmentFactor;\r\n            ws.style.height = newHeight + \"px\";\r\n        });\r\n        page.style.width = \"\";\r\n    });\r\n\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(true);\r\n    }\r\n}\r\n\r\nexport function toggleWorkspaceHighlight(isChecked) {\r\n    if (isChecked) {\r\n        document.body.classList.add(\"highlight-workspace\");\r\n        if (!document.querySelector(\".workspace-container\")) {\r\n            document.querySelectorAll(\".workspace\").forEach((workspace) => {\r\n                const container = document.createElement(\"div\");\r\n                container.classList.add(\"workspace-container\");\r\n                container.style.height =\r\n                    window.getComputedStyle(workspace).height;\r\n                const original = document.createElement(\"div\");\r\n                original.classList.add(\"original-workspace\");\r\n                const originalHeight =\r\n                    workspace.getAttribute(\"data-space\") || \"0px\";\r\n                original.setAttribute(\r\n                    \"title\",\r\n                    \"Author-specified workspace height (\" +\r\n                        originalHeight +\r\n                        \")\"\r\n                );\r\n                original.style.height = originalHeight;\r\n                container.appendChild(original);\r\n                if (original.offsetHeight > workspace.offsetHeight) {\r\n                    original.classList.add(\"warning\");\r\n                }\r\n                workspace.parentNode.insertBefore(container, workspace);\r\n                container.appendChild(workspace);\r\n            });\r\n        }\r\n    } else {\r\n        document.body.classList.remove(\"highlight-workspace\");\r\n        document\r\n            .querySelectorAll(\".workspace-container\")\r\n            .forEach((container) => {\r\n                const workspace = container.querySelector(\".workspace\");\r\n                container.parentNode.insertBefore(workspace, container);\r\n                container.remove();\r\n            });\r\n    }\r\n}\r\n\r\nexport function processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n", "/**\r\n * Dynamic-programming page-break algorithm.\r\n *\r\n * Given a list of content blocks with heights and workspace heights,\r\n * finds page-break positions that minimize leftover whitespace variance\r\n * across pages.\r\n */\r\n\r\nexport function findPageBreaks(rows, pageHeight) {\r\n    let pageBreaks = [];\r\n    let minCost = Array(rows.length + 1).fill(Infinity);\r\n    minCost[rows.length] = 0;\r\n    let nextPageBreak = Array(rows.length).fill(-1);\r\n\r\n    for (let i = rows.length - 1; i >= 0; i--) {\r\n        let cumulativeHeight = 0;\r\n        for (let j = i; j < rows.length; j++) {\r\n            cumulativeHeight += rows[j].height;\r\n            if (cumulativeHeight > pageHeight) {\r\n                if (j === i) {\r\n                    // Single row exceeds page height \u2014 give it its own page\r\n                    minCost[i] = 0;\r\n                    nextPageBreak[i] = i + 1;\r\n                }\r\n                break;\r\n            }\r\n\r\n            const cost =\r\n                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];\r\n            if (cost < minCost[i]) {\r\n                minCost[i] = cost;\r\n                nextPageBreak[i] = j + 1;\r\n            }\r\n        }\r\n    }\r\n\r\n    // Backtrack: row 0 is always a title sharing the first page with row 1\r\n    let nextPage = 1;\r\n    while (nextPage < rows.length) {\r\n        pageBreaks.push(nextPageBreak[nextPage]);\r\n        nextPage = nextPageBreak[nextPage];\r\n    }\r\n    return pageBreaks;\r\n}\r\n", "/**\r\n * Print-preview page creation and adjustment.\r\n *\r\n * Handles flattening paragraph sections, waiting for images,\r\n * adjusting pre-existing pages, and algorithmically creating\r\n * new page divisions for printout content.\r\n */\r\n\r\nimport {\r\n    getElementTotalHeight,\r\n    getElemWorkspaceHeight,\r\n} from \"./geometry.js\";\r\nimport { setInitialWorkspaceHeights } from \"./workspace.js\";\r\nimport { findPageBreaks } from \"./page-breaks.js\";\r\n\r\nexport function flattenParagraphsSections(printout) {\r\n    const paragraphsSections = printout.querySelectorAll(\r\n        \"section.paragraphs\"\r\n    );\r\n    paragraphsSections.forEach((section) => {\r\n        const parent = section.parentNode;\r\n        while (section.firstChild) {\r\n            parent.insertBefore(section.firstChild, section);\r\n        }\r\n        parent.removeChild(section);\r\n    });\r\n}\r\n\r\nexport function waitForImages(container, timeoutMs = 5000) {\r\n    const images = container.querySelectorAll(\"img\");\r\n    const promises = [];\r\n    for (const img of images) {\r\n        if (!img.complete) {\r\n            promises.push(\r\n                new Promise((resolve) => {\r\n                    img.addEventListener(\"load\", resolve, { once: true });\r\n                    img.addEventListener(\"error\", resolve, { once: true });\r\n                })\r\n            );\r\n        }\r\n    }\r\n    if (promises.length === 0) return Promise.resolve();\r\n    return Promise.race([\r\n        Promise.all(promises),\r\n        new Promise((resolve) => setTimeout(resolve, timeoutMs)),\r\n    ]);\r\n}\r\n\r\nexport function adjustPrintoutPages() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    if (pages.length === 0) return;\r\n\r\n    const firstPage = pages[0];\r\n    const lastPage = pages[pages.length - 1];\r\n\r\n    // Move all children before the first page into the first page\r\n    const pageFirstChild = firstPage.firstChild;\r\n    let currentChild = printout.firstChild;\r\n    while (currentChild && currentChild !== firstPage) {\r\n        const nextChild = currentChild.nextSibling;\r\n        firstPage.insertBefore(currentChild, pageFirstChild);\r\n        currentChild = nextChild;\r\n    }\r\n\r\n    // Move all children after the last page into the last page\r\n    let nextChild = lastPage.nextSibling;\r\n    while (nextChild) {\r\n        const tempChild = nextChild;\r\n        nextChild = nextChild.nextSibling;\r\n        lastPage.appendChild(tempChild);\r\n    }\r\n}\r\n\r\nexport function createPrintoutPages(margins) {\r\n    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);\r\n    const conservativeContentWidth = 794 - (margins.left + margins.right);\r\n\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    printout.style.width =\r\n        (conservativeContentWidth + margins.left + margins.right).toString() +\r\n        \"px\";\r\n    setInitialWorkspaceHeights(printout);\r\n\r\n    // Build list of blocks, handling sidebyside and tasks\r\n    let rows = [];\r\n    for (const child of printout.children) {\r\n        if (child.classList.contains(\"sidebyside\")) {\r\n            rows.push(child);\r\n        } else if (child.querySelector(\".task\")) {\r\n            rows.push(child);\r\n            const tasks = child.querySelectorAll(\".task, .conclusion\");\r\n\r\n            for (let i = 0; i < tasks.length; i++) {\r\n                let parent = tasks[i].parentElement;\r\n                let grandparent = parent.parentElement;\r\n                if (grandparent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subsubtask\");\r\n                } else if (parent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subtask\");\r\n                }\r\n            }\r\n            for (let i = tasks.length - 1; i > 0; i--) {\r\n                printout.insertBefore(tasks[i], child.nextSibling);\r\n            }\r\n        } else {\r\n            rows.push(child);\r\n        }\r\n    }\r\n\r\n    // Build block list with height info\r\n    let blockList = [];\r\n    for (const row of rows) {\r\n        let blockHeight = getElementTotalHeight(row);\r\n        if (blockHeight === 0) continue;\r\n\r\n        let totalWorkspaceHeight = 0;\r\n        if (row.querySelector(\".workspace\")) {\r\n            totalWorkspaceHeight = getElemWorkspaceHeight(row);\r\n        }\r\n        blockList.push({\r\n            elem: row,\r\n            height: blockHeight,\r\n            workspaceHeight: totalWorkspaceHeight,\r\n        });\r\n    }\r\n\r\n    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);\r\n\r\n    // Create page divs\r\n    for (let i = 0; i < pageBreaks.length; i++) {\r\n        const pageDiv = document.createElement(\"section\");\r\n        pageDiv.classList.add(\"onepage\");\r\n        if (i === 0) pageDiv.classList.add(\"firstpage\");\r\n        if (i === pageBreaks.length - 1) pageDiv.classList.add(\"lastpage\");\r\n\r\n        const start = pageBreaks[i - 1] || 0;\r\n        const end = pageBreaks[i];\r\n        for (let j = start; j < end; j++) {\r\n            pageDiv.appendChild(blockList[j].elem);\r\n        }\r\n        printout.appendChild(pageDiv);\r\n    }\r\n\r\n    // Remove content not in a page\r\n    for (const child of Array.from(printout.children)) {\r\n        if (!child.classList.contains(\"onepage\")) {\r\n            printout.removeChild(child);\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview header and footer management.\r\n *\r\n * Adds editable header/footer divs to each page, populates them from\r\n * localStorage or data attributes, and persists edits back to localStorage.\r\n */\r\n\r\nexport function addHeadersAndFootersToPrintout() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    pages.forEach((page, index) => {\r\n        const isFirstPage = index === 0;\r\n\r\n        const headerDiv = document.createElement(\"div\");\r\n        headerDiv.classList.add(\r\n            isFirstPage ? \"first-page-header\" : \"running-header\",\r\n            \"hidden\"\r\n        );\r\n        headerDiv.innerHTML = `<div class=\"header-left\" contenteditable=\"true\"></div><div class=\"header-center\" contenteditable=\"true\"></div><div class=\"header-right\" contenteditable=\"true\"></div>`;\r\n        page.insertBefore(headerDiv, page.firstChild);\r\n\r\n        const footerDiv = document.createElement(\"div\");\r\n        footerDiv.classList.add(\r\n            isFirstPage ? \"first-page-footer\" : \"running-footer\",\r\n            \"hidden\"\r\n        );\r\n        footerDiv.innerHTML = `<div class=\"footer-left\" contenteditable=\"true\"></div><div class=\"footer-center\" contenteditable=\"true\"></div><div class=\"footer-right\" contenteditable=\"true\"></div>`;\r\n        page.appendChild(footerDiv);\r\n    });\r\n\r\n    // Populate from localStorage or data attributes\r\n    const keys = [\r\n        \"header-first-left\",\r\n        \"header-first-center\",\r\n        \"header-first-right\",\r\n        \"footer-first-left\",\r\n        \"footer-first-center\",\r\n        \"footer-first-right\",\r\n        \"header-running-left\",\r\n        \"header-running-center\",\r\n        \"header-running-right\",\r\n        \"footer-running-left\",\r\n        \"footer-running-center\",\r\n        \"footer-running-right\",\r\n    ];\r\n\r\n    const content = {};\r\n    keys.forEach((key) => {\r\n        content[key] =\r\n            localStorage.getItem(key) ||\r\n            printout.getAttribute(`data-${key}`) ||\r\n            \"\";\r\n    });\r\n\r\n    // First page\r\n    const firstHeader = document.querySelector(\".first-page-header\");\r\n    if (firstHeader) {\r\n        firstHeader.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-first-left\"];\r\n        firstHeader.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-first-center\"];\r\n        firstHeader.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-first-right\"];\r\n    }\r\n    const firstFooter = document.querySelector(\".first-page-footer\");\r\n    if (firstFooter) {\r\n        firstFooter.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-first-left\"];\r\n        firstFooter.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-first-center\"];\r\n        firstFooter.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-first-right\"];\r\n    }\r\n\r\n    // Running headers and footers\r\n    document.querySelectorAll(\".running-header\").forEach((headerDiv) => {\r\n        headerDiv.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-running-left\"];\r\n        headerDiv.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-running-center\"];\r\n        headerDiv.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-running-right\"];\r\n    });\r\n    document.querySelectorAll(\".running-footer\").forEach((footerDiv) => {\r\n        footerDiv.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-running-left\"];\r\n        footerDiv.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-running-center\"];\r\n        footerDiv.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-running-right\"];\r\n    });\r\n\r\n    // Persist edits to localStorage\r\n    const selectorMap = {\r\n        \"header-first-left\": \".first-page-header .header-left\",\r\n        \"header-first-center\": \".first-page-header .header-center\",\r\n        \"header-first-right\": \".first-page-header .header-right\",\r\n        \"footer-first-left\": \".first-page-footer .footer-left\",\r\n        \"footer-first-center\": \".first-page-footer .footer-center\",\r\n        \"footer-first-right\": \".first-page-footer .footer-right\",\r\n        \"header-running-left\": \".running-header .header-left\",\r\n        \"header-running-center\": \".running-header .header-center\",\r\n        \"header-running-right\": \".running-header .header-right\",\r\n        \"footer-running-left\": \".running-footer .footer-left\",\r\n        \"footer-running-center\": \".running-footer .footer-center\",\r\n        \"footer-running-right\": \".running-footer .footer-right\",\r\n    };\r\n    keys.forEach((key) => {\r\n        const elements = document.querySelectorAll(selectorMap[key]);\r\n        elements.forEach((elem) => {\r\n            elem.addEventListener(\"input\", () => {\r\n                localStorage.setItem(key, elem.innerHTML);\r\n            });\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Paper size detection.\r\n *\r\n * Determines paper size (letter vs a4) from localStorage, or falls back\r\n * to geographic detection via ipapi.co.\r\n */\r\n\r\nexport function getPaperSize() {\r\n    let paperSize = localStorage.getItem(\"papersize\");\r\n    if (paperSize) return paperSize;\r\n\r\n    // Try to set papersize based on user's geographic region\r\n    try {\r\n        fetch(\"https://ipapi.co/json/\")\r\n            .then((response) => response.json())\r\n            .then((data) => {\r\n                const continent =\r\n                    data && data.continent_code ? data.continent_code : \"\";\r\n                paperSize =\r\n                    continent === \"NA\" || continent === \"SA\"\r\n                        ? \"letter\"\r\n                        : \"a4\";\r\n                const radio = document.querySelector(\r\n                    `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n                );\r\n                if (radio) {\r\n                    radio.checked = true;\r\n                    localStorage.setItem(\"papersize\", paperSize);\r\n                }\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(paperSize);\r\n            })\r\n            .catch((err) => {\r\n                throw err;\r\n            });\r\n    } catch (e) {\r\n        const radio = document.querySelector(\r\n            'input[name=\"papersize\"][value=\"letter\"]'\r\n        );\r\n        if (radio) radio.checked = true;\r\n    }\r\n    return paperSize || \"letter\";\r\n}\r\n", "/**\r\n * Printout section loading (print preview).\r\n *\r\n * Swaps the current page content with the target printable section\r\n * and switches to the print-worksheet stylesheet.\r\n */\r\n\r\nexport async function loadPrintout(printableSectionID) {\r\n    const themeStylesheetLink = document.querySelector(\r\n        'link[rel=\"stylesheet\"][href*=\"theme\"]'\r\n    );\r\n    const themeStylesheetHref = themeStylesheetLink\r\n        ? themeStylesheetLink.getAttribute(\"href\")\r\n        : null;\r\n\r\n    if (themeStylesheetHref) {\r\n        const printStylesheetHref = themeStylesheetHref.replace(\r\n            /theme.*\\.css/,\r\n            \"print-worksheet.css\"\r\n        );\r\n        themeStylesheetLink.setAttribute(\"href\", printStylesheetHref);\r\n        await new Promise((resolve) => {\r\n            themeStylesheetLink.addEventListener(\"load\", resolve, {\r\n                once: true,\r\n            });\r\n        });\r\n    }\r\n\r\n    const printableSection = document.getElementById(printableSectionID);\r\n    if (!printableSection) {\r\n        console.error(\"No section found with ID:\", printableSectionID);\r\n        return;\r\n    }\r\n\r\n    const ptxContent = document.querySelector(\".ptx-content\");\r\n    const existingSections = ptxContent.querySelectorAll(\":scope > section\");\r\n    existingSections.forEach((sec) => ptxContent.removeChild(sec));\r\n    ptxContent.appendChild(printableSection);\r\n}\r\n", "/**\r\n * Solution rewriting for print preview.\r\n *\r\n * Converts <details>/<summary> solution elements into plain <div>s\r\n * with a heading, so they render properly in print layout.\r\n */\r\n\r\nexport function rewriteSolutions() {\r\n    const bornHiddenKnowls = document.querySelectorAll(\r\n        \".worksheet details, .handout details\"\r\n    );\r\n    bornHiddenKnowls.forEach(function (detail) {\r\n        const summary = detail.querySelector(\"summary\");\r\n        const content = detail.innerHTML.replace(summary.outerHTML, \"\");\r\n        const div = document.createElement(\"div\");\r\n        div.classList = detail.classList;\r\n        if (summary) {\r\n            const title = document.createElement(\"h5\");\r\n            title.innerHTML = summary.innerHTML;\r\n            div.appendChild(title);\r\n        }\r\n        const body = document.createElement(\"div\");\r\n        body.innerHTML = content;\r\n        div.appendChild(body);\r\n        detail.parentNode.replaceChild(div, detail);\r\n    });\r\n}\r\n", "/**\r\n * Print-preview initialization and controls.\r\n *\r\n * Orchestrates the print-preview workflow: loading the printout section,\r\n * setting up paper size controls, managing solution visibility, creating\r\n * or adjusting pages, and wiring up header/footer toggles.\r\n */\r\n\r\nimport { toPixels, setPageGeometryCSS } from \"./geometry.js\";\r\nimport {\r\n    adjustWorkspaceToFitPage,\r\n    toggleWorkspaceHighlight,\r\n} from \"./workspace.js\";\r\nimport {\r\n    flattenParagraphsSections,\r\n    waitForImages,\r\n    adjustPrintoutPages,\r\n    createPrintoutPages,\r\n} from \"./pages.js\";\r\nimport { addHeadersAndFootersToPrintout } from \"./headers-footers.js\";\r\nimport { getPaperSize } from \"./paper-size.js\";\r\nimport { loadPrintout } from \"./section-swap.js\";\r\nimport { rewriteSolutions } from \"./solutions.js\";\r\n\r\nexport async function initPrintPreview() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"printpreview\")) return;\r\n\r\n    const printableSectionID = urlParams.get(\"printpreview\");\r\n    await loadPrintout(printableSectionID);\r\n\r\n    // Parse margins\r\n    const marginList = document\r\n        .querySelector(\"section.worksheet, section.handout\")\r\n        .getAttribute(\"data-margins\")\r\n        .split(\" \");\r\n    const margins = {\r\n        top: toPixels(marginList[0] || \"0.75in\"),\r\n        right: toPixels(marginList[1] || \"0.75in\"),\r\n        bottom: toPixels(marginList[2] || \"0.75in\"),\r\n        left: toPixels(marginList[3] || \"0.75in\"),\r\n    };\r\n\r\n    rewriteSolutions();\r\n\r\n    // Paper size setup\r\n    let paperSize = getPaperSize();\r\n    if (paperSize) {\r\n        const radio = document.querySelector(\r\n            `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n        );\r\n        if (radio) radio.checked = true;\r\n        document.body.classList.remove(\"a4\", \"letter\");\r\n        document.body.classList.add(paperSize);\r\n        setPageGeometryCSS({ paperSize, margins });\r\n    }\r\n\r\n    // Paper size radio change handlers\r\n    const papersizeRadios = document.querySelectorAll(\r\n        'input[name=\"papersize\"]'\r\n    );\r\n    papersizeRadios.forEach((radio) => {\r\n        radio.addEventListener(\"change\", function () {\r\n            if (this.checked) {\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(this.value);\r\n                localStorage.setItem(\"papersize\", this.value);\r\n                setPageGeometryCSS({ paperSize: this.value, margins });\r\n                adjustWorkspaceToFitPage({\r\n                    paperSize: this.value,\r\n                    margins,\r\n                });\r\n            }\r\n        });\r\n    });\r\n\r\n    // Solution visibility checkboxes\r\n    for (const solutionType of [\"hint\", \"answer\", \"solution\"]) {\r\n        const checkbox = document.getElementById(\r\n            `hide-${solutionType}-checkbox`\r\n        );\r\n        if (!checkbox) continue;\r\n\r\n        const storageKey = `hide-${solutionType}`;\r\n        if (\r\n            (solutionType === \"answer\" || solutionType === \"solution\") &&\r\n            !localStorage.getItem(storageKey)\r\n        ) {\r\n            checkbox.checked = true;\r\n            localStorage.setItem(storageKey, \"true\");\r\n        }\r\n\r\n        checkbox.checked = localStorage.getItem(storageKey) === \"true\";\r\n        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.add(\"hidden\");\r\n            } else {\r\n                elem.classList.remove(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(storageKey, this.checked);\r\n            document\r\n                .querySelectorAll(`div.${solutionType}`)\r\n                .forEach((elem) => {\r\n                    if (checkbox.checked) {\r\n                        elem.classList.add(\"hidden\");\r\n                    } else {\r\n                        elem.classList.remove(\"hidden\");\r\n                    }\r\n                    adjustWorkspaceToFitPage({ paperSize, margins });\r\n                });\r\n        });\r\n    }\r\n\r\n    // Build pages\r\n    const printoutSection = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (printoutSection) {\r\n        flattenParagraphsSections(printoutSection);\r\n        await waitForImages(printoutSection);\r\n    }\r\n\r\n    if (document.querySelector(\".onepage\")) {\r\n        adjustPrintoutPages();\r\n    } else {\r\n        createPrintoutPages(margins);\r\n    }\r\n\r\n    addHeadersAndFootersToPrintout();\r\n\r\n    // Header/footer toggle checkboxes\r\n    for (const hf of [\r\n        \"first-page-header\",\r\n        \"running-header\",\r\n        \"first-page-footer\",\r\n        \"running-footer\",\r\n    ]) {\r\n        const checkbox = document.getElementById(`print-${hf}-checkbox`);\r\n        if (!checkbox) continue;\r\n\r\n        checkbox.checked =\r\n            localStorage.getItem(`print-${hf}`) === \"true\";\r\n        document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.remove(\"hidden\");\r\n            } else {\r\n                elem.classList.add(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(`print-${hf}`, this.checked);\r\n            document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n                if (checkbox.checked) {\r\n                    elem.classList.remove(\"hidden\");\r\n                } else {\r\n                    elem.classList.add(\"hidden\");\r\n                }\r\n                adjustWorkspaceToFitPage({ paperSize, margins });\r\n            });\r\n        });\r\n    }\r\n\r\n    // Adjust workspace heights\r\n    adjustWorkspaceToFitPage({ paperSize, margins });\r\n\r\n    // Highlight workspace checkbox\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    if (highlightCheckbox) {\r\n        highlightCheckbox.checked =\r\n            localStorage.getItem(\"highlightWorkspace\") === \"true\";\r\n        highlightCheckbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(\"highlightWorkspace\", this.checked);\r\n            toggleWorkspaceHighlight(this.checked);\r\n        });\r\n        toggleWorkspaceHighlight(highlightCheckbox.checked);\r\n    }\r\n}\r\n", "/**\r\n * Dark/light mode switching.\r\n *\r\n * Detects user preference via localStorage or `prefers-color-scheme`,\r\n * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.\r\n */\r\n\r\nexport function isDarkMode() {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return false;\r\n\r\n    const currentTheme = localStorage.getItem(\"theme\");\r\n    if (currentTheme === \"dark\") return true;\r\n    if (currentTheme === \"light\") return false;\r\n\r\n    return (\r\n        window.matchMedia &&\r\n        window.matchMedia(\"(prefers-color-scheme: dark)\").matches\r\n    );\r\n}\r\n\r\nexport function setDarkMode(isDark) {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return;\r\n\r\n    const parentHtml = document.documentElement;\r\n    const iframes = document.querySelectorAll(\r\n        \"iframe[data-dark-mode-enabled]\"\r\n    );\r\n\r\n    if (isDark) {\r\n        parentHtml.classList.add(\"dark-mode\");\r\n    } else {\r\n        parentHtml.classList.remove(\"dark-mode\");\r\n    }\r\n\r\n    // Sync each iframe's <html> class with the parent\r\n    for (const iframe of iframes) {\r\n        try {\r\n            const iframeHtml = iframe.contentWindow.document.documentElement;\r\n            if (isDark) {\r\n                iframeHtml.classList.add(\"dark-mode\");\r\n            } else {\r\n                iframeHtml.classList.remove(\"dark-mode\");\r\n            }\r\n        } catch (err) {\r\n            console.warn(\"Dark mode sync to iframe failed:\", err);\r\n        }\r\n    }\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.querySelector(\".icon\").innerText = isDark\r\n            ? \"light_mode\"\r\n            : \"dark_mode\";\r\n        modeButton.querySelector(\".name\").innerText = isDark\r\n            ? \"Light Mode\"\r\n            : \"Dark Mode\";\r\n    }\r\n}\r\n\r\nexport function initThemeToggle() {\r\n    // Run immediately to avoid flicker\r\n    setDarkMode(isDarkMode());\r\n\r\n    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)\r\n    const isDark = isDarkMode();\r\n    setDarkMode(isDark);\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.addEventListener(\"click\", function () {\r\n            const wasDark = isDarkMode();\r\n            setDarkMode(!wasDark);\r\n            localStorage.setItem(\"theme\", wasDark ? \"light\" : \"dark\");\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * Embed/share button and embed-mode display.\r\n *\r\n * Provides the \"embed in LMS\" button that copies an <iframe> snippet,\r\n * and strips chrome when the page is loaded in embed mode (?embed).\r\n */\r\n\r\nimport { setDarkMode } from \"./theme.js\";\r\n\r\nexport function initShareButton() {\r\n    const shareButton = document.getElementById(\"embed-button\");\r\n    if (!shareButton) return;\r\n\r\n    const sharePopup = document.getElementById(\"embed-popup\");\r\n    const embedCode =\r\n        \"<iframe src='\" +\r\n        window.location.href +\r\n        \"?embed' width='100%' height='1000px' frameborder='0'></iframe>\";\r\n    const embedTextbox = document.getElementById(\"embed-code-textbox\");\r\n    if (embedTextbox) {\r\n        embedTextbox.value = embedCode;\r\n    }\r\n\r\n    shareButton.addEventListener(\"click\", function () {\r\n        sharePopup.classList.toggle(\"hidden\");\r\n    });\r\n\r\n    const copyButton = document.getElementById(\"copy-embed-button\");\r\n    if (copyButton) {\r\n        copyButton.addEventListener(\"click\", function () {\r\n            const textbox = document.getElementById(\"embed-code-textbox\");\r\n            if (textbox) {\r\n                navigator.clipboard\r\n                    .writeText(embedCode)\r\n                    .then(() => {\r\n                        console.log(\"Embed code copied to clipboard!\");\r\n                    })\r\n                    .catch((err) => {\r\n                        console.error(\"Failed to copy embed code: \", err);\r\n                    });\r\n                copyButton.querySelector(\".icon\").innerText =\r\n                    \"library_add_check\";\r\n                setTimeout(function () {\r\n                    copyButton.querySelector(\".icon\").innerText =\r\n                        \"content_copy\";\r\n                    sharePopup.classList.add(\"hidden\");\r\n                }, 450);\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initEmbedMode() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"embed\")) return;\r\n\r\n    // Set dark mode based on value of param\r\n    if (urlParams.get(\"embed\") === \"dark\") {\r\n        setDarkMode(true);\r\n    } else {\r\n        setDarkMode(false);\r\n    }\r\n\r\n    const elemsToHide = [\r\n        \"ptx-navbar\",\r\n        \"ptx-masthead\",\r\n        \"ptx-page-footer\",\r\n        \"ptx-sidebar\",\r\n        \"ptx-content-footer\",\r\n    ];\r\n    for (const id of elemsToHide) {\r\n        const elem = document.getElementById(id);\r\n        if (elem) {\r\n            elem.classList.add(\"hidden\");\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Code block copy-to-clipboard button.\r\n *\r\n * Wraps `.clipboardable` elements with a container and injects a copy\r\n * button.  Clicking the button copies the `<pre>` content.\r\n */\r\n\r\nexport function initCodeCopyButtons() {\r\n    const elements = document.querySelectorAll(\".clipboardable\");\r\n    for (const el of elements) {\r\n        const div = document.createElement(\"div\");\r\n        div.classList.add(\"clipboardable\");\r\n        el.classList.remove(\"clipboardable\");\r\n        el.replaceWith(div);\r\n        div.insertAdjacentElement(\"afterbegin\", el);\r\n        div.insertAdjacentHTML(\r\n            \"beforeend\",\r\n            `\r\n    <button class=\"code-copy\" title=\"Copy code\" role=\"button\" aria-label=\"Copy code\" >\r\n        <span class=\"copyicon material-symbols-outlined\">content_copy</span>\r\n        <span class=\"checkmark material-symbols-outlined\">check</span>\r\n    </button>\r\n            `.trim()\r\n        );\r\n    }\r\n}\r\n\r\nexport function initCodeCopyHandler() {\r\n    document.addEventListener(\"click\", (ev) => {\r\n        const codeBox = ev.target.closest(\".clipboardable\");\r\n        if (!navigator.clipboard || !codeBox) return;\r\n        const button = ev.target.closest(\".code-copy\");\r\n        if (!button) return;\r\n        const preContent = codeBox.querySelector(\"pre\").textContent;\r\n        navigator.clipboard.writeText(preContent);\r\n        button.classList.toggle(\"copied\");\r\n        setTimeout(() => button.classList.toggle(\"copied\"), 1000);\r\n    });\r\n}\r\n", "/**\r\n * Auto-ID generation for paragraphs without IDs.\r\n *\r\n * \u26A0\uFE0F DEPRECATED / SUSPICIOUS: Generates IDs like \"base-id-part2\", \"base-id-part3\"\r\n * for <p> elements that lack an id, based on the nearest preceding <p> that has one.\r\n * Produces heavy console.log output. It is unclear whether any downstream code\r\n * depends on the generated IDs.\r\n */\r\n\r\nexport function initAutoId() {\r\n    const noIdParagraphs = document.querySelectorAll(\".main p:not([id])\");\r\n    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {\r\n        const e = noIdParagraphs[n];\r\n        if (e.hasAttribute(\"id\")) continue;\r\n        if (e.classList.contains(\"watermark\")) continue;\r\n\r\n        // Find all preceding sibling <p> elements\r\n        const prevParagraphs = [];\r\n        let sibling = e.previousElementSibling;\r\n        while (sibling) {\r\n            if (sibling.tagName === \"P\") {\r\n                prevParagraphs.push(sibling);\r\n            }\r\n            sibling = sibling.previousElementSibling;\r\n        }\r\n\r\n        if (prevParagraphs.length === 0) continue;\r\n\r\n        let partsFound = 1;\r\n        const partsToId = [e];\r\n        for (let i = 0; i < prevParagraphs.length; ++i) {\r\n            const thisPrevious = prevParagraphs[i];\r\n            if (!thisPrevious.hasAttribute(\"id\")) {\r\n                partsToId.unshift(thisPrevious);\r\n            } else {\r\n                const baseId = thisPrevious.id;\r\n                for (let j = 0; j < partsToId.length; ++j) {\r\n                    ++partsFound;\r\n                    const nextId = baseId + \"-part\" + partsFound.toString();\r\n                    partsToId[j].setAttribute(\"id\", nextId);\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Video magnification (resize YouTube iframes to full browser width).\r\n *\r\n * \u26A0\uFE0F DEAD CODE: The selector `body iframeXXXX` intentionally matches no\r\n * elements.  This module is preserved for reference but has no effect.\r\n */\r\n\r\nexport function initVideoMagnify() {\r\n    const allIframes = document.querySelectorAll(\"body iframeXXXX\");\r\n    for (let i = 0; i < allIframes.length; i++) {\r\n        const thisItem = allIframes[i];\r\n        const thisItemSrc = thisItem.src;\r\n        if (!thisItemSrc.includes(\"youtube\")) continue;\r\n\r\n        const thisItemId = thisItem.id;\r\n        const thisItemWidth = thisItem.width;\r\n        const thisItemHeight = thisItem.height;\r\n        if (thisItemHeight < 150) continue;\r\n\r\n        const emptyDiv = document.createElement(\"div\");\r\n        const videomagContainer = document.createElement(\"div\");\r\n        const parentTag = thisItem.parentElement.tagName;\r\n        if (parentTag === \"FIGURE\") {\r\n            videomagContainer.setAttribute(\"class\", \"videobig\");\r\n        } else {\r\n            videomagContainer.setAttribute(\"class\", \"videobig nofigure\");\r\n        }\r\n        videomagContainer.setAttribute(\"video-id\", thisItemId);\r\n        videomagContainer.setAttribute(\"data-width\", thisItemWidth);\r\n        videomagContainer.setAttribute(\"data-height\", thisItemHeight);\r\n        videomagContainer.innerHTML = \"fit width\";\r\n\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", videomagContainer);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n    }\r\n\r\n    // Toggle handlers\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const bigBtn = event.target.closest(\".videobig\");\r\n        if (bigBtn) {\r\n            const videoId = bigBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = parseInt(bigBtn.getAttribute(\"data-width\"));\r\n            const originalHeight = parseInt(bigBtn.getAttribute(\"data-height\"));\r\n            const browserWidth = window.innerWidth;\r\n            const widthRatio = browserWidth / originalWidth;\r\n\r\n            video.setAttribute(\"width\", widthRatio * originalWidth);\r\n            video.setAttribute(\"height\", widthRatio * originalHeight);\r\n            video.setAttribute(\r\n                \"style\",\r\n                \"position:relative; 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+  "sourcesContent": ["/**\r\n * TOC, sidebar, and navigation (from pretext.js).\r\n *\r\n * Manages the table-of-contents sidebar: scroll-to-active, toggle\r\n * visibility, auto-collapse, focused/expandable TOC items, and\r\n * hash-based navigation.\r\n */\r\n\r\nfunction getOffsetTop(e) {\r\n    if (!e) return 0;\r\n    return getOffsetTop(e.offsetParent) + e.offsetTop;\r\n}\r\n\r\nfunction scrollTocToActive() {\r\n    let fileNameWHash = window.location.href.split(\"/\").pop();\r\n    let fileName = fileNameWHash.split(\"#\")[0];\r\n\r\n    let tocEntry = document.querySelector(\r\n        '#ptx-toc a[href=\"' + fileName + '\"]'\r\n    );\r\n    if (!tocEntry) return;\r\n\r\n    let tocEntryTop = 0;\r\n    if (fileNameWHash.includes(\"#\")) {\r\n        let tocEntryWHash = document.querySelector(\r\n            '#ptx-toc a[href=\"' + fileNameWHash + '\"]'\r\n        );\r\n        if (tocEntryWHash) {\r\n            tocEntry\r\n                .closest(\"li\")\r\n                .querySelectorAll(\"li\")\r\n                .forEach((li) => {\r\n                    li.classList.remove(\"active\");\r\n                });\r\n            tocEntryWHash.closest(\"li\").classList.add(\"active\");\r\n            tocEntryTop = getOffsetTop(tocEntryWHash);\r\n        }\r\n    }\r\n    if (!tocEntryTop) {\r\n        tocEntryTop = getOffsetTop(tocEntry);\r\n    }\r\n\r\n    tocEntry.closest(\"li\").classList.add(\"active\");\r\n    let toc = document.querySelector(\"#ptx-toc\");\r\n    let tocTop = getOffsetTop(toc);\r\n    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;\r\n}\r\n\r\nfunction toggletoc() {\r\n    const thesidebar = document.getElementById(\"ptx-sidebar\");\r\n    if (\r\n        thesidebar.classList.contains(\"hidden\") ||\r\n        thesidebar.classList.contains(\"visible\")\r\n    ) {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else if (thesidebar.offsetParent === null) {\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n    }\r\n    scrollTocToActive();\r\n}\r\n\r\nfunction samePageLink(a) {\r\n    if (!(a instanceof HTMLAnchorElement)) return false;\r\n    try {\r\n        const linkUrl = new URL(a.href, document.baseURI);\r\n        const currentUrl = new URL(window.location.href);\r\n        const sameDocument =\r\n            linkUrl.origin === currentUrl.origin &&\r\n            linkUrl.pathname === currentUrl.pathname &&\r\n            linkUrl.search === currentUrl.search;\r\n        return sameDocument && !!linkUrl.hash;\r\n    } catch (e) {\r\n        return false;\r\n    }\r\n}\r\n\r\nfunction getTOCItemType(item) {\r\n    for (let className of item.classList) {\r\n        if (\r\n            className !== \"toc-item\" &&\r\n            className.length > 3 &&\r\n            className.slice(0, 4) === \"toc-\"\r\n        )\r\n            return className.slice(4);\r\n    }\r\n    return \"\";\r\n}\r\n\r\nfunction getTOCItemDepth(item) {\r\n    let depth = 0;\r\n    let curParent = item.closest(\".toc-item-list\");\r\n    while (curParent !== null) {\r\n        depth++;\r\n        curParent = curParent.parentElement.closest(\".toc-item-list\");\r\n    }\r\n    return depth;\r\n}\r\n\r\nfunction toggleTOCItem(expander) {\r\n    let listItem = expander.closest(\".toc-item\");\r\n    listItem.classList.toggle(\"expanded\");\r\n    let expanded = listItem.classList.contains(\"expanded\");\r\n    let itemType = getTOCItemType(listItem);\r\n\r\n    if (expanded) {\r\n        expander.title = \"Close\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    } else {\r\n        expander.title = \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    }\r\n\r\n    for (const childUL of listItem.querySelectorAll(\r\n        \":scope > ul.toc-item-list\"\r\n    )) {\r\n        for (const childItem of childUL.querySelectorAll(\r\n            \":scope > li.toc-item\"\r\n        )) {\r\n            if (expanded) {\r\n                childItem.classList.add(\"visible\");\r\n                childItem.classList.remove(\"hidden\");\r\n            } else {\r\n                childItem.classList.remove(\"visible\");\r\n                childItem.classList.add(\"hidden\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initToc() {\r\n    const thetocbutton = document.getElementsByClassName(\"toc-toggle\")[0];\r\n    if (thetocbutton) {\r\n        thetocbutton.addEventListener(\"click\", (e) => {\r\n            toggletoc();\r\n            e.stopPropagation();\r\n        });\r\n    }\r\n\r\n    // Auto-collapse TOC when clicking outside\r\n    if (\r\n        getComputedStyle(document.documentElement).getPropertyValue(\r\n            \"--auto-collapse-toc\"\r\n        ) == \"yes\"\r\n    ) {\r\n        const sidebar = document.getElementById(\"ptx-sidebar\");\r\n\r\n        window.addEventListener(\"click\", function (event) {\r\n            if (sidebar.classList.contains(\"visible\")) {\r\n                if (!event.composedPath().includes(sidebar)) {\r\n                    toggletoc();\r\n                }\r\n            }\r\n        });\r\n\r\n        sidebar.addEventListener(\"click\", function (event) {\r\n            if (samePageLink(event.target.closest(\"a\"))) {\r\n                toggletoc();\r\n            }\r\n        });\r\n\r\n        window.addEventListener(\"pageshow\", (e) => {\r\n            if (e.persisted) {\r\n                sidebar.classList.remove(\"visible\");\r\n                sidebar.classList.add(\"hidden\");\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initFocusedToc() {\r\n    if (document.querySelector(\".ptx-toc.focused\") === null) return;\r\n\r\n    let maxDepth = 1000;\r\n    for (let className of document.querySelector(\".ptx-toc\").classList)\r\n        if (className.length > 5 && className.slice(0, 5) === \"depth\")\r\n            maxDepth = Number(className.slice(5));\r\n\r\n    let preexpandedLevels = 1;\r\n    let tocDataSet = document.querySelector(\".ptx-toc\").dataset;\r\n    if (typeof tocDataSet.preexpandedLevels !== \"undefined\")\r\n        preexpandedLevels = Number(tocDataSet.preexpandedLevels);\r\n\r\n    let tocItems = document.querySelectorAll(\r\n        \".ptx-toc ul.structural > .toc-item\"\r\n    );\r\n    for (const tocItem of tocItems) {\r\n        let hasChildren =\r\n            tocItem.querySelector(\"ul.structural\") !== null;\r\n        let depth = getTOCItemDepth(tocItem);\r\n\r\n        if (hasChildren && depth < maxDepth) {\r\n            let expander = document.createElement(\"button\");\r\n            expander.classList.add(\"toc-expander\");\r\n            expander.classList.add(\"toc-chevron-surround\");\r\n            expander.title = \"toc-expander\";\r\n            expander.innerHTML =\r\n                '<span class=\"icon material-symbols-outlined\" aria-hidden=\"true\"></span>';\r\n            tocItem.querySelector(\".toc-title-box\").append(expander);\r\n            expander.addEventListener(\"click\", () => {\r\n                toggleTOCItem(expander);\r\n            });\r\n\r\n            let isActive =\r\n                tocItem.classList.contains(\"contains-active\") ||\r\n                tocItem.classList.contains(\"active\");\r\n            let preExpanded = isActive || depth < preexpandedLevels;\r\n            let itemType = getTOCItemType(tocItem);\r\n            if (preExpanded) {\r\n                toggleTOCItem(expander);\r\n            } else {\r\n                expander.title =\r\n                    \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n            }\r\n        }\r\n    }\r\n\r\n    // Expand parents of hash-linked TOC item\r\n    if (window.location.hash) {\r\n        let hash = window.location.hash;\r\n        let hashLink = document.querySelector(\r\n            `.ptx-toc a[href$=\"${hash}\"]`\r\n        );\r\n        if (hashLink) {\r\n            let parentTocItem = hashLink.closest(\".toc-item\");\r\n            while (\r\n                parentTocItem &&\r\n                !parentTocItem.classList.contains(\"contains-active\")\r\n            ) {\r\n                parentTocItem.classList.add(\"contains-active\");\r\n                let expander =\r\n                    parentTocItem.querySelector(\".toc-expander\");\r\n                if (expander) {\r\n                    if (!parentTocItem.classList.contains(\"expanded\")) {\r\n                        toggleTOCItem(expander);\r\n                    }\r\n                }\r\n                parentTocItem =\r\n                    parentTocItem.parentElement.closest(\".toc-item\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initScrollToc() {\r\n    scrollTocToActive();\r\n    window.onhashchange = scrollTocToActive;\r\n}\r\n", "/**\r\n * Knowl behavior (from knowl.js).\r\n *\r\n * Manages xref knowls and born-hidden knowls: click-to-reveal with\r\n * slide animation, lazy content fetching, and MathJax re-typesetting.\r\n */\r\n\r\n// Used to animate both types of knowls\r\nclass SlideRevealer {\r\n    static STATE = Object.freeze({\r\n        INACTIVE: 0,\r\n        CLOSING: 1,\r\n        EXPANDING: 2,\r\n    });\r\n\r\n    constructor(triggerElement, contentElement, animatedElement) {\r\n        this.triggerElement = triggerElement;\r\n        this.contentElement = contentElement;\r\n        this.animatedElement = animatedElement;\r\n\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        this.triggerElement.addEventListener(\"click\", (e) => this.onClick(e));\r\n    }\r\n\r\n    onClick(e) {\r\n        if (e) e.preventDefault();\r\n        this.animatedElement.style.overflow = \"hidden\";\r\n\r\n        if (\r\n            this.animationState === SlideRevealer.STATE.CLOSING ||\r\n            !this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.animatedElement.setAttribute(\"open\", \"\");\r\n            this.triggerElement.setAttribute(\"open\", \"\");\r\n            this.contentElement.style.display = \"\";\r\n            MathJax.typesetPromise().then(() =>\r\n                window.requestAnimationFrame(() => this.toggle(true))\r\n            );\r\n        } else if (\r\n            this.animationState === SlideRevealer.STATE.EXPANDING ||\r\n            this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.toggle(false);\r\n        }\r\n    }\r\n\r\n    toggle(expanding) {\r\n        let closedHeight = 0;\r\n        if (this.animatedElement.contains(this.triggerElement))\r\n            closedHeight = this.triggerElement.offsetHeight;\r\n        const fullHeight = closedHeight + this.contentElement.offsetHeight;\r\n\r\n        const startHeight = `${expanding ? closedHeight : fullHeight}px`;\r\n        const endHeight = `${expanding ? fullHeight : closedHeight}px`;\r\n\r\n        const padding =\r\n            this.animatedElement.offsetHeight -\r\n            this.animatedElement.clientHeight;\r\n        const startPad = `${expanding ? 0 : padding}px`;\r\n        const endPad = `${expanding ? padding : 0}px`;\r\n\r\n        if (this.animation) this.animation.cancel();\r\n\r\n        const animDuration = Math.max(\r\n            Math.min(\r\n                (Math.abs(closedHeight - fullHeight) / 400) * 1000,\r\n                750\r\n            ),\r\n            250\r\n        );\r\n\r\n        this.animationState = expanding\r\n            ? SlideRevealer.STATE.EXPANDING\r\n            : SlideRevealer.STATE.CLOSING;\r\n        this.animation = this.animatedElement.animate(\r\n            {\r\n                height: [startHeight, endHeight],\r\n                paddingTop: [startPad, endPad],\r\n                paddingBottom: [startPad, endPad],\r\n            },\r\n            { duration: animDuration, easing: \"ease\" }\r\n        );\r\n\r\n        this.animation.onfinish = () => {\r\n            this.onAnimationFinish(expanding);\r\n        };\r\n        this.animation.oncancel = () => {\r\n            this.animationState = SlideRevealer.STATE.INACTIVE;\r\n        };\r\n    }\r\n\r\n    onAnimationFinish(isOpen) {\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        if (!isOpen) {\r\n            this.animatedElement.removeAttribute(\"open\");\r\n            this.triggerElement.removeAttribute(\"open\");\r\n        }\r\n\r\n        this.animatedElement.style.overflow = \"\";\r\n        if (!isOpen) this.contentElement.style.display = \"none\";\r\n\r\n        if (isOpen) {\r\n            let hasCallback =\r\n                this.contentElement.querySelectorAll(\r\n                    \"[data-knowl-callback]\"\r\n                );\r\n            hasCallback.forEach((el) => {\r\n                window[el.getAttribute(\"data-knowl-callback\")](el, open);\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nclass LinkKnowl {\r\n    static xrefCount = 0;\r\n\r\n    static initializeXrefKnowl(knowlLinkElement) {\r\n        if (\r\n            knowlLinkElement.getAttribute(\"data-knowl-uid\") === null\r\n        ) {\r\n            return new LinkKnowl(knowlLinkElement);\r\n        }\r\n    }\r\n\r\n    constructor(knowlLinkElement) {\r\n        this.linkElement = knowlLinkElement;\r\n        this.outputElement = null;\r\n        this.uid = LinkKnowl.xrefCount++;\r\n        knowlLinkElement.setAttribute(\"data-knowl-uid\", this.uid);\r\n        knowlLinkElement.setAttribute(\"role\", \"button\");\r\n        knowlLinkElement.setAttribute(\r\n            \"data-base-title\",\r\n            knowlLinkElement.getAttribute(\"title\") ||\r\n                this.linkElement.textContent\r\n        );\r\n        knowlLinkElement.classList.add(\"knowl__link\");\r\n        this.updateLabels(false);\r\n        knowlLinkElement.addEventListener(\r\n            \"click\",\r\n            this.handleLinkClick.bind(this)\r\n        );\r\n    }\r\n\r\n    updateLabels(isVisible) {\r\n        const verb = isVisible\r\n            ? this.linkElement.getAttribute(\"data-close-label\") || \"Close\"\r\n            : this.linkElement.getAttribute(\"data-reveal-label\") ||\r\n              \"Reveal\";\r\n        const targetDescript =\r\n            this.linkElement.getAttribute(\"data-base-title\");\r\n        const helpText = verb + \" \" + targetDescript;\r\n        this.linkElement.setAttribute(\"aria-label\", helpText);\r\n        this.linkElement.setAttribute(\"title\", helpText);\r\n    }\r\n\r\n    toggle() {\r\n        this.linkElement.classList.toggle(\"active\");\r\n        const isActive = this.linkElement.classList.contains(\"active\");\r\n        this.updateLabels(isActive);\r\n\r\n        if (isActive) {\r\n            const h = this.outputElement.getBoundingClientRect().height;\r\n            if (h > window.innerHeight) {\r\n                this.outputElement.scrollIntoView(true);\r\n            } else {\r\n                if (\r\n                    this.outputElement.getBoundingClientRect().bottom >\r\n                    window.innerHeight\r\n                )\r\n                    this.outputElement.scrollIntoView(false);\r\n            }\r\n        }\r\n    }\r\n\r\n    findOutputLocation() {\r\n        const invalidParents =\r\n            \"table, mjx-container, div.tabular-box, .runestone > .parsons\";\r\n        let el = this.linkElement.parentElement;\r\n        let problemAncestor = el.closest(invalidParents);\r\n        while (problemAncestor && problemAncestor !== el) {\r\n            el = problemAncestor;\r\n            problemAncestor = el.closest(invalidParents);\r\n        }\r\n        return el;\r\n    }\r\n\r\n    createOutputElement() {\r\n        const outputId = \"knowl-uid-\" + this.uid;\r\n        const outputContentsId = \"knowl-output-\" + this.uid;\r\n        const linkTarget =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n\r\n        const placeholderText =\r\n            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +\r\n            `Loading '${linkTarget}'` +\r\n            `</div>`;\r\n\r\n        const temp = document.createElement(\"template\");\r\n        temp.innerHTML = placeholderText;\r\n        this.outputElement = temp.content.children[0];\r\n\r\n        const insertLoc = this.findOutputLocation(this.linkElement);\r\n        insertLoc.after(this.outputElement);\r\n    }\r\n\r\n    async getContent() {\r\n        const contentURL =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n        const knowlContent = await fetch(contentURL)\r\n            .then((response) => response.text())\r\n            .then((data) => {\r\n                let knowlDoc = new DOMParser().parseFromString(\r\n                    data,\r\n                    \"text/html\"\r\n                );\r\n                let tempContainer = knowlDoc.body;\r\n                let scripts = knowlDoc.querySelectorAll(\"head script\");\r\n                tempContainer.append(...scripts);\r\n                return tempContainer;\r\n            })\r\n            .catch((error) => {\r\n                const destination =\r\n                    this.linkElement.getAttribute(\"href\");\r\n                const text = this.linkElement.textContent;\r\n                const err_message =\r\n                    `<div class='knowl-output__error'>` +\r\n                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +\r\n                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +\r\n                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href=\"https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally\">PreTeXt FAQ</a> for more information.</div>` +\r\n                    `</div>`;\r\n                return err_message;\r\n            });\r\n        return knowlContent;\r\n    }\r\n\r\n    handleLinkClick(event) {\r\n        event.preventDefault();\r\n\r\n        if (this.outputElement !== null) {\r\n            this.toggle();\r\n        } else {\r\n            this.createOutputElement();\r\n\r\n            const slideHandler = new SlideRevealer(\r\n                this.linkElement,\r\n                this.outputElement,\r\n                this.outputElement\r\n            );\r\n            this.linkElement.addEventListener(\"click\", slideHandler);\r\n\r\n            let loadingTimeout = setTimeout(() => {\r\n                loadingTimeout = null;\r\n                slideHandler.onClick();\r\n                this.toggle();\r\n            }, 500);\r\n\r\n            const content = this.getContent();\r\n\r\n            content\r\n                .then((tempContainer) => {\r\n                    if (loadingTimeout !== null) {\r\n                        clearTimeout(loadingTimeout);\r\n                    }\r\n                    setTimeout(() => {\r\n                        slideHandler.onClick();\r\n                        this.toggle();\r\n                    }, 100);\r\n\r\n                    const runestoneElements =\r\n                        tempContainer.querySelectorAll(\r\n                            \".ptx-runestone-container\"\r\n                        );\r\n                    [...runestoneElements].forEach((e) => {\r\n                        const rsId =\r\n                            e.querySelector(\"[data-component]\")?.id;\r\n                        const onPage = document.getElementById(rsId);\r\n                        if (onPage) {\r\n                            e.innerHTML = `<div class=\"para\">The interactive that belongs here is already on the page and cannot appear multiple times. <a href=\"#${rsId}\">Scroll to interactive.</a>`;\r\n                        } else {\r\n                            window.runestoneComponents.renderOneComponent(\r\n                                e\r\n                            );\r\n                        }\r\n                    });\r\n\r\n                    const children = [...tempContainer.children];\r\n                    this.outputElement.innerHTML = \"\";\r\n                    this.outputElement.append(...children);\r\n\r\n                    addKnowls(this.outputElement);\r\n                    Prism.highlightAllUnder(this.outputElement);\r\n\r\n                    [\r\n                        ...this.outputElement.getElementsByTagName(\r\n                            \"script\"\r\n                        ),\r\n                    ].forEach((s) => {\r\n                        if (\r\n                            s.getAttribute(\"type\") === null ||\r\n                            s.getAttribute(\"type\") ===\r\n                                \"text/javascript\"\r\n                        ) {\r\n                            eval(s.innerHTML);\r\n                        }\r\n                    });\r\n                })\r\n                .catch((data) => {\r\n                    console.log(\r\n                        \"Error fetching knowl content: \" + data\r\n                    );\r\n                });\r\n        }\r\n    }\r\n}\r\n\r\nexport function addKnowls(target) {\r\n    const xrefs = target.querySelectorAll(\"[data-knowl]\");\r\n    for (const xref of xrefs) {\r\n        LinkKnowl.initializeXrefKnowl(xref);\r\n    }\r\n\r\n    const bornHiddens = target.querySelectorAll(\".born-hidden-knowl\");\r\n    for (const bhk of bornHiddens) {\r\n        const summary = bhk.querySelector(\":scope > summary\");\r\n        const contents = bhk.querySelector(\":scope > summary + *\");\r\n        new SlideRevealer(summary, contents, bhk);\r\n    }\r\n}\r\n\r\nexport function initKnowls() {\r\n    addKnowls(document);\r\n}\r\n", "/**\r\n * LTI iframe resizer (from lti_iframe_resizer.js).\r\n *\r\n * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),\r\n * adjusting iframe dimensions based on postMessage events.\r\n *\r\n * @see https://cssplice.org/\r\n */\r\n\r\nexport function sendResizeRequest(el) {\r\n    el.contentWindow.postMessage(\"requestResize\", \"*\");\r\n}\r\n\r\nexport function initLtiIframeResizer() {\r\n    window.addEventListener(\"message\", function (event) {\r\n        let edata = event.data;\r\n\r\n        // MoM sends event.data as a string instead of JSON\r\n        if (\r\n            typeof event.data == \"string\" &&\r\n            event.data.match(/lti\\.frameResize/)\r\n        ) {\r\n            edata = JSON.parse(event.data);\r\n        }\r\n\r\n        if (edata.subject === \"lti.frameResize\") {\r\n            if (\"frame_id\" in edata) {\r\n                const el = document.getElementById(edata[\"frame_id\"]);\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n                if (\r\n                    edata.wrapheight &&\r\n                    document.getElementById(edata[\"frame_id\"] + \"wrap\")\r\n                ) {\r\n                    document.getElementById(\r\n                        edata[\"frame_id\"] + \"wrap\"\r\n                    ).style.height = edata.wrapheight + \"px\";\r\n                }\r\n            } else if (\"iframe_resize_id\" in edata) {\r\n                const el = document.getElementById(\r\n                    edata[\"iframe_resize_id\"]\r\n                );\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n            } else {\r\n                const iFrames =\r\n                    document.getElementsByTagName(\"iframe\");\r\n                for (const iFrame of iFrames) {\r\n                    if (iFrame.contentWindow === event.source) {\r\n                        if (edata.height) {\r\n                            iFrame.height = edata.height;\r\n                            iFrame.style.height = edata.height + \"px\";\r\n                        }\r\n                        if (edata.width) {\r\n                            iFrame.width = edata.width;\r\n                            iFrame.style.width = edata.width + \"px\";\r\n                        }\r\n                        break;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Permalink copy-to-clipboard functionality.\r\n *\r\n * Copies permalink URLs to the clipboard using the Clipboard API,\r\n * with a brief visual confirmation message.\r\n */\r\n\r\nasync function copyPermalink(linkNode) {\r\n    if (!navigator.clipboard) {\r\n        console.log(\"Error: Clipboard API not available\");\r\n        return;\r\n    }\r\n    const elem = linkNode.parentElement;\r\n    if (!linkNode) {\r\n        console.log(\"Error: Something went wrong finding permalink URL\");\r\n        return;\r\n    }\r\n    const url = linkNode.href;\r\n    const description = elem.getAttribute(\"data-description\");\r\n    const link = `<a href=\"${url}\">${description}</a>`;\r\n    const msgLink = `<a class=\"internal\" href=\"${url}\">${description}</a>`;\r\n    const textFallback = description + \" \\r\\n\" + url;\r\n    let copySuccess = true;\r\n\r\n    try {\r\n        // NOTE: this method will only work in Firefox if the user has\r\n        //    dom.events.asyncClipboard.clipboardItem\r\n        // set to true in their about:config.\r\n        await navigator.clipboard.write([\r\n            new ClipboardItem({\r\n                \"text/html\": new Blob([link], { type: \"text/html\" }),\r\n                \"text/plain\": new Blob([textFallback], { type: \"text/plain\" }),\r\n            }),\r\n        ]);\r\n    } catch (err) {\r\n        console.log(\r\n            \"Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText\",\r\n            err\r\n        );\r\n        copySuccess = false;\r\n    }\r\n\r\n    if (!copySuccess) {\r\n        try {\r\n            await navigator.clipboard.writeText(textFallback);\r\n        } catch (err) {\r\n            console.log(\r\n                \"Permalink-to-clipboard using clipboard.writeText failed\",\r\n                err\r\n            );\r\n            console.error(\"Failed to copy link to clipboard!\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    console.log(`copied '${url}' to clipboard`);\r\n    const copiedMsg = document.createElement(\"p\");\r\n    copiedMsg.setAttribute(\"role\", \"alert\");\r\n    copiedMsg.className = \"permalink-alert\";\r\n    copiedMsg.innerHTML = \"Link to \" + msgLink + \" copied to clipboard\";\r\n    elem.parentElement.insertBefore(copiedMsg, elem);\r\n    await new Promise((resolve) => setTimeout(resolve, 1500));\r\n    copiedMsg.remove();\r\n}\r\n\r\nexport function initPermalinks() {\r\n    const permalinks = document.querySelectorAll(\".autopermalink > a\");\r\n    permalinks.forEach((link) => {\r\n        link.addEventListener(\"click\", function (event) {\r\n            event.preventDefault();\r\n            copyPermalink(link);\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Image magnification (click-to-zoom).\r\n *\r\n * Clicking an eligible image creates a full-width popup; clicking the\r\n * popup dismisses it.  Uses event delegation on the document body.\r\n */\r\n\r\n/**\r\n * Walk up from `el` through ancestors, collecting those that match `selector`.\r\n * Returns the *last* (outermost) match \u2014 equivalent to jQuery's\r\n * `.parents(selector).last()`.\r\n */\r\nfunction outermostMatchingAncestor(el, selector) {\r\n    let match = null;\r\n    let current = el.parentElement;\r\n    while (current) {\r\n        if (current.matches(selector)) {\r\n            match = current;\r\n        }\r\n        current = current.parentElement;\r\n    }\r\n    return match;\r\n}\r\n\r\nexport function initImageMagnify() {\r\n    const imgSelector =\r\n        \".image-box > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \".sbspanel > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > div > img:not(.draw_on_me):not(.mag_popup)\";\r\n\r\n    // Click an image to magnify\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const img = event.target.closest(imgSelector);\r\n        if (!img) return;\r\n\r\n        const container = document.createElement(\"div\");\r\n        container.setAttribute(\"style\", \"background:#fff;\");\r\n        container.setAttribute(\"class\", \"mag_popup_container\");\r\n        container.innerHTML =\r\n            '<img src=\"' +\r\n            img.src +\r\n            '\" style=\"width:100%\" class=\"mag_popup\"/>';\r\n\r\n        let placement = outermostMatchingAncestor(\r\n            img,\r\n            \".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)\"\r\n        );\r\n\r\n        // For .cols2, even articles go inside the previous odd one\r\n        if (placement && placement.tagName === \"ARTICLE\") {\r\n            const prev = placement.previousElementSibling;\r\n            if (prev) {\r\n                placement = prev.firstElementChild || prev;\r\n            }\r\n        }\r\n\r\n        if (placement) {\r\n            placement.parentNode.insertBefore(container, placement);\r\n        }\r\n    });\r\n\r\n    // Click the big image to dismiss it\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        if (event.target.classList.contains(\"mag_popup\")) {\r\n            event.target.parentNode.remove();\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Scrollbar width detection utility.\r\n *\r\n * \u26A0\uFE0F DEPRECATED: Only used by the GeoGebra calculator integration.\r\n * Consider replacing with a CSS-based approach in the future.\r\n *\r\n * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript\r\n */\r\n\r\nexport function getScrollbarWidth() {\r\n    const outer = document.createElement(\"div\");\r\n    outer.style.visibility = \"hidden\";\r\n    outer.style.width = \"100px\";\r\n    outer.style.msOverflowStyle = \"scrollbar\"; // needed for WinJS apps\r\n\r\n    document.body.appendChild(outer);\r\n\r\n    const widthNoScroll = outer.offsetWidth;\r\n    outer.style.overflow = \"scroll\";\r\n\r\n    const inner = document.createElement(\"div\");\r\n    inner.style.width = \"100%\";\r\n    outer.appendChild(inner);\r\n\r\n    const widthWithScroll = inner.offsetWidth;\r\n    outer.parentNode.removeChild(outer);\r\n\r\n    return widthNoScroll - widthWithScroll;\r\n}\r\n", "/**\r\n * GeoGebra calculator integration.\r\n *\r\n * Manages the floating GeoGebra calculator overlay: toggling visibility,\r\n * preventing body scroll while hovering the canvas, and injecting the\r\n * GeoGebra applet script on first open.\r\n */\r\n\r\nimport { getScrollbarWidth } from \"./deprecated/scrollbar-width.js\";\r\n\r\nfunction calculatorOnload() {\r\n    const toggle = document.getElementById(\"calculator-toggle\");\r\n    if (toggle) toggle.focus();\r\n    const inputField = document.querySelector(\r\n        \"input.gwt-SuggestBox.TextField\"\r\n    );\r\n    if (inputField) inputField.focus();\r\n}\r\n\r\nexport function initGeoGebra() {\r\n    const scrollWidth = getScrollbarWidth();\r\n    const calcOffsetR = 5;\r\n    const calcOffsetB = 5;\r\n\r\n    // Prevent body scroll when hovering the GeoGebra canvas\r\n    document.body.addEventListener(\"mouseover\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"hidden\";\r\n        document.documentElement.style.marginRight = \"15px\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + scrollWidth + \"px\";\r\n            container.style.bottom = calcOffsetB + scrollWidth + \"px\";\r\n        }\r\n    });\r\n\r\n    document.body.addEventListener(\"mouseout\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"scroll\";\r\n        document.documentElement.style.marginRight = \"0\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + \"px\";\r\n            container.style.bottom = calcOffsetB + \"px\";\r\n        }\r\n    });\r\n\r\n    // Toggle calculator visibility\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const toggle = event.target.closest(\"#calculator-toggle\");\r\n        if (!toggle) return;\r\n\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (!container) return;\r\n\r\n        if (container.style.display === \"none\" || !container.style.display) {\r\n            container.style.display = \"block\";\r\n            toggle.classList.add(\"open\");\r\n            toggle.setAttribute(\"title\", \"Hide calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"true\");\r\n\r\n            const existingScript = document.getElementById(\"create_ggb_calc\");\r\n            if (!existingScript) {\r\n                const ggbScript = document.createElement(\"script\");\r\n                ggbScript.id = \"create_ggb_calc\";\r\n                ggbScript.innerHTML = \"ggbApp.inject('geogebra-calculator')\";\r\n                document.body.appendChild(ggbScript);\r\n            } else {\r\n                calculatorOnload();\r\n            }\r\n        } else {\r\n            container.style.display = \"none\";\r\n            toggle.classList.remove(\"open\");\r\n            toggle.setAttribute(\"title\", \"Show calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"false\");\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Keyboard navigation handlers.\r\n *\r\n * - ENTER in a `.workspace` triggers MathJax typesetting.\r\n * - ESC navigates back through Sage cell focus, then up the knowl stack,\r\n *   or does nothing if no interactive context is active.\r\n * - Hash-based anchor navigation: opens knowls linked via URL hash.\r\n */\r\n\r\nlet justHitEscape = false;\r\n\r\nfunction processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n\r\nexport function initKeyboardNav() {\r\n    document.onkeyup = function (event) {\r\n        const e = event || window.event;\r\n        switch (e.keyCode) {\r\n            case 13: // ENTER\r\n                justHitEscape = false;\r\n                if (\r\n                    document.activeElement.classList.contains(\"workspace\")\r\n                ) {\r\n                    processWorkspace();\r\n                }\r\n                break; // Fixed: was missing, caused fallthrough to ESC handler\r\n\r\n            case 27: // ESC\r\n            {\r\n                const parentSageCell =\r\n                    document.activeElement.closest(\".sagecell_editor\");\r\n                if (parentSageCell && !justHitEscape) {\r\n                    justHitEscape = true;\r\n                    setTimeout(function () {\r\n                        justHitEscape = false;\r\n                    }, 1000);\r\n                }\r\n                // knowl_focus_stack is defined in knowl.js and may not exist\r\n                // in all contexts \u2014 guard against ReferenceError\r\n                else if (\r\n                    typeof knowl_focus_stack !== \"undefined\" &&\r\n                    knowl_focus_stack.length > 0\r\n                ) {\r\n                    const mostRecentlyOpened = knowl_focus_stack.pop();\r\n                    if (typeof knowl_focus_stack_uid !== \"undefined\") {\r\n                        knowl_focus_stack_uid.pop();\r\n                    }\r\n                    mostRecentlyOpened.focus();\r\n                } else {\r\n                    break;\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    };\r\n}\r\n\r\nexport function initAnchorKnowl() {\r\n    if (!window.location.hash.length) return;\r\n\r\n    const id = window.location.hash.substring(1);\r\n    const anchor = document.getElementById(id);\r\n    if (!anchor) return;\r\n\r\n    if (anchor.tagName === \"ARTICLE\") {\r\n        const containedKnowl = anchor.querySelector(\"a[data-knowl]\");\r\n        if (containedKnowl && containedKnowl.parentElement === anchor) {\r\n            containedKnowl.click();\r\n        }\r\n    } else if (anchor.hasAttribute(\"data-knowl\")) {\r\n        anchor.click();\r\n    } else {\r\n        // If it is a hidden knowl, find the knowl and open it\r\n        const hiddenContent = anchor.closest(\".hidden-content\");\r\n        if (hiddenContent) {\r\n            const refId = hiddenContent.id;\r\n            const knowl = document.querySelector(\r\n                '[data-refid=\"' + refId + '\"]'\r\n            );\r\n            if (knowl) knowl.click();\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview page geometry helpers.\r\n *\r\n * Utilities for converting CSS units to pixels, computing element heights,\r\n * and injecting dynamic @page / CSS-variable rules.\r\n */\r\n\r\nexport function toPixels(value) {\r\n    if (typeof value === \"number\") return value;\r\n    if (typeof value !== \"string\") return 0;\r\n    value = value.trim();\r\n    if (value.endsWith(\"px\")) {\r\n        return parseFloat(value);\r\n    } else if (value.endsWith(\"in\")) {\r\n        return Math.floor(parseFloat(value) * 96);\r\n    } else if (value.endsWith(\"cm\")) {\r\n        return Math.floor(parseFloat(value) * 37.8);\r\n    } else if (value.endsWith(\"mm\")) {\r\n        return Math.floor(parseFloat(value) * 3.78);\r\n    } else if (value.endsWith(\"pt\")) {\r\n        return Math.floor(parseFloat(value) * (96 / 72));\r\n    } else {\r\n        return parseFloat(value) || 0;\r\n    }\r\n}\r\n\r\nexport function getElementTotalHeight(elem) {\r\n    const style = getComputedStyle(elem);\r\n    const marginTop = parseFloat(style.marginTop);\r\n    const marginBottom = parseFloat(style.marginBottom);\r\n    const height = elem.offsetHeight;\r\n    return height + marginTop + marginBottom;\r\n}\r\n\r\nexport function getElemWorkspaceHeight(elem) {\r\n    if (elem.classList.contains(\"sidebyside\")) {\r\n        const sbspanels = elem.querySelectorAll(\".sbspanel\");\r\n        let max = 0;\r\n        sbspanels.forEach((panel) => {\r\n            const workspaces = panel.querySelectorAll(\".workspace\");\r\n            let totalHeight = 0;\r\n            workspaces.forEach((workspace) => {\r\n                const workspaceHeight = workspace.offsetHeight;\r\n                if (workspaceHeight) {\r\n                    totalHeight += workspaceHeight;\r\n                }\r\n            });\r\n            if (totalHeight > max) {\r\n                max = totalHeight;\r\n            }\r\n        });\r\n        return max;\r\n    }\r\n\r\n    let columns = 1;\r\n    if (elem.classList.contains(\"exercisegroup\")) {\r\n        for (let i = 2; i <= 6; i++) {\r\n            if (elem.querySelector(`.cols${i}`)) {\r\n                columns = i;\r\n                break;\r\n            }\r\n        }\r\n    }\r\n    const workspaces = elem.querySelectorAll(\".workspace\");\r\n    let totalHeight = 0;\r\n    workspaces.forEach((ws) => {\r\n        const workspaceHeight = ws.offsetHeight;\r\n        if (workspaceHeight) {\r\n            totalHeight += workspaceHeight;\r\n        }\r\n    });\r\n    return totalHeight / columns;\r\n}\r\n\r\nexport function setPageGeometryCSS({ paperSize, margins }) {\r\n    const existingStyle = document.getElementById(\"page-geometry-css\");\r\n    if (existingStyle) {\r\n        existingStyle.remove();\r\n    }\r\n    const wsWidth = paperSize === \"letter\" ? \"816px\" : \"794px\";\r\n    const wsHeight = paperSize === \"letter\" ? \"1056px\" : \"1123px\";\r\n\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"page-geometry-css\";\r\n    style.textContent = `\r\n        :root {\r\n            --ws-width: ${wsWidth};\r\n            --ws-height: ${wsHeight};\r\n            --ws-top-margin: ${margins.top}px;\r\n            --ws-right-margin: ${margins.right}px;\r\n            --ws-bottom-margin: ${margins.bottom}px;\r\n            --ws-left-margin: ${margins.left}px;\r\n        }\r\n        @page {\r\n            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);\r\n        }\r\n    `;\r\n    document.head.appendChild(style);\r\n}\r\n", "/**\r\n * Print-preview workspace height management.\r\n *\r\n * Handles setting initial workspace heights from data attributes,\r\n * adjusting heights to fit pages, highlighting workspace areas,\r\n * and MathJax re-typesetting on workspace edits.\r\n */\r\n\r\nimport { getElementTotalHeight, getElemWorkspaceHeight } from \"./geometry.js\";\r\n\r\nexport function setInitialWorkspaceHeights() {\r\n    const workspaces = document.querySelectorAll(\".workspace\");\r\n    workspaces.forEach((ws) => {\r\n        ws.style.height = ws.getAttribute(\"data-space\") || \"0px\";\r\n        ws.setAttribute(\"contenteditable\", \"true\");\r\n    });\r\n}\r\n\r\nexport function adjustWorkspaceToFitPage({ paperSize, margins }) {\r\n    // Toggle off workspace highlight if it is on\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(false);\r\n    }\r\n\r\n    let paperWidth, paperHeight;\r\n    if (paperSize === \"a4\" || document.body.classList.contains(\"a4\")) {\r\n        paperWidth = 794;\r\n        paperHeight = 1122.5;\r\n    } else {\r\n        paperWidth = 816;\r\n        paperHeight = 1056;\r\n    }\r\n    const paperContentHeight = paperHeight - (margins.top + margins.bottom);\r\n\r\n    setInitialWorkspaceHeights();\r\n\r\n    const pages = document.querySelectorAll(\".onepage\");\r\n    pages.forEach((page) => {\r\n        page.style.width = paperWidth + \"px\";\r\n        const rows = page.children;\r\n        let totalContentHeight = 0;\r\n        let totalWorkspaceHeight = 0;\r\n        for (const row of rows) {\r\n            totalContentHeight += getElementTotalHeight(row);\r\n            totalWorkspaceHeight += getElemWorkspaceHeight(row);\r\n        }\r\n        if (totalWorkspaceHeight === 0) {\r\n            page.style.width = \"\";\r\n            return;\r\n        }\r\n        const extraHeight = paperContentHeight - totalContentHeight;\r\n        const workspaceAdjustmentFactor =\r\n            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;\r\n        const pageWorkspaces = page.querySelectorAll(\".workspace\");\r\n        pageWorkspaces.forEach((ws) => {\r\n            const originalHeight = ws.offsetHeight;\r\n            const newHeight = originalHeight * workspaceAdjustmentFactor;\r\n            ws.style.height = newHeight + \"px\";\r\n        });\r\n        page.style.width = \"\";\r\n    });\r\n\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(true);\r\n    }\r\n}\r\n\r\nexport function toggleWorkspaceHighlight(isChecked) {\r\n    if (isChecked) {\r\n        document.body.classList.add(\"highlight-workspace\");\r\n        if (!document.querySelector(\".workspace-container\")) {\r\n            document.querySelectorAll(\".workspace\").forEach((workspace) => {\r\n                const container = document.createElement(\"div\");\r\n                container.classList.add(\"workspace-container\");\r\n                container.style.height =\r\n                    window.getComputedStyle(workspace).height;\r\n                const original = document.createElement(\"div\");\r\n                original.classList.add(\"original-workspace\");\r\n                const originalHeight =\r\n                    workspace.getAttribute(\"data-space\") || \"0px\";\r\n                original.setAttribute(\r\n                    \"title\",\r\n                    \"Author-specified workspace height (\" +\r\n                        originalHeight +\r\n                        \")\"\r\n                );\r\n                original.style.height = originalHeight;\r\n                container.appendChild(original);\r\n                if (original.offsetHeight > workspace.offsetHeight) {\r\n                    original.classList.add(\"warning\");\r\n                }\r\n                workspace.parentNode.insertBefore(container, workspace);\r\n                container.appendChild(workspace);\r\n            });\r\n        }\r\n    } else {\r\n        document.body.classList.remove(\"highlight-workspace\");\r\n        document\r\n            .querySelectorAll(\".workspace-container\")\r\n            .forEach((container) => {\r\n                const workspace = container.querySelector(\".workspace\");\r\n                container.parentNode.insertBefore(workspace, container);\r\n                container.remove();\r\n            });\r\n    }\r\n}\r\n\r\nexport function processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n", "/**\r\n * Dynamic-programming page-break algorithm.\r\n *\r\n * Given a list of content blocks with heights and workspace heights,\r\n * finds page-break positions that minimize leftover whitespace variance\r\n * across pages.\r\n */\r\n\r\nexport function findPageBreaks(rows, pageHeight) {\r\n    let pageBreaks = [];\r\n    let minCost = Array(rows.length + 1).fill(Infinity);\r\n    minCost[rows.length] = 0;\r\n    let nextPageBreak = Array(rows.length).fill(-1);\r\n\r\n    for (let i = rows.length - 1; i >= 0; i--) {\r\n        let cumulativeHeight = 0;\r\n        for (let j = i; j < rows.length; j++) {\r\n            cumulativeHeight += rows[j].height;\r\n            if (cumulativeHeight > pageHeight) {\r\n                if (j === i) {\r\n                    // Single row exceeds page height \u2014 give it its own page\r\n                    minCost[i] = 0;\r\n                    nextPageBreak[i] = i + 1;\r\n                }\r\n                break;\r\n            }\r\n\r\n            const cost =\r\n                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];\r\n            if (cost < minCost[i]) {\r\n                minCost[i] = cost;\r\n                nextPageBreak[i] = j + 1;\r\n            }\r\n        }\r\n    }\r\n\r\n    // Backtrack: row 0 is always a title sharing the first page with row 1\r\n    let nextPage = 1;\r\n    while (nextPage < rows.length) {\r\n        pageBreaks.push(nextPageBreak[nextPage]);\r\n        nextPage = nextPageBreak[nextPage];\r\n    }\r\n    return pageBreaks;\r\n}\r\n", "/**\r\n * Print-preview page creation and adjustment.\r\n *\r\n * Handles flattening paragraph sections, waiting for images,\r\n * adjusting pre-existing pages, and algorithmically creating\r\n * new page divisions for printout content.\r\n */\r\n\r\nimport {\r\n    getElementTotalHeight,\r\n    getElemWorkspaceHeight,\r\n} from \"./geometry.js\";\r\nimport { setInitialWorkspaceHeights } from \"./workspace.js\";\r\nimport { findPageBreaks } from \"./page-breaks.js\";\r\n\r\nexport function flattenParagraphsSections(printout) {\r\n    const paragraphsSections = printout.querySelectorAll(\r\n        \"section.paragraphs\"\r\n    );\r\n    paragraphsSections.forEach((section) => {\r\n        const parent = section.parentNode;\r\n        while (section.firstChild) {\r\n            parent.insertBefore(section.firstChild, section);\r\n        }\r\n        parent.removeChild(section);\r\n    });\r\n}\r\n\r\nexport function waitForImages(container, timeoutMs = 5000) {\r\n    const images = container.querySelectorAll(\"img\");\r\n    const promises = [];\r\n    for (const img of images) {\r\n        if (!img.complete) {\r\n            promises.push(\r\n                new Promise((resolve) => {\r\n                    img.addEventListener(\"load\", resolve, { once: true });\r\n                    img.addEventListener(\"error\", resolve, { once: true });\r\n                })\r\n            );\r\n        }\r\n    }\r\n    if (promises.length === 0) return Promise.resolve();\r\n    return Promise.race([\r\n        Promise.all(promises),\r\n        new Promise((resolve) => setTimeout(resolve, timeoutMs)),\r\n    ]);\r\n}\r\n\r\nexport function adjustPrintoutPages() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    if (pages.length === 0) return;\r\n\r\n    const firstPage = pages[0];\r\n    const lastPage = pages[pages.length - 1];\r\n\r\n    // Move all children before the first page into the first page\r\n    const pageFirstChild = firstPage.firstChild;\r\n    let currentChild = printout.firstChild;\r\n    while (currentChild && currentChild !== firstPage) {\r\n        const nextChild = currentChild.nextSibling;\r\n        firstPage.insertBefore(currentChild, pageFirstChild);\r\n        currentChild = nextChild;\r\n    }\r\n\r\n    // Move all children after the last page into the last page\r\n    let nextChild = lastPage.nextSibling;\r\n    while (nextChild) {\r\n        const tempChild = nextChild;\r\n        nextChild = nextChild.nextSibling;\r\n        lastPage.appendChild(tempChild);\r\n    }\r\n}\r\n\r\nexport function createPrintoutPages(margins) {\r\n    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);\r\n    const conservativeContentWidth = 794 - (margins.left + margins.right);\r\n\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    printout.style.width =\r\n        (conservativeContentWidth + margins.left + margins.right).toString() +\r\n        \"px\";\r\n    setInitialWorkspaceHeights(printout);\r\n\r\n    // Build list of blocks, handling sidebyside and tasks\r\n    let rows = [];\r\n    for (const child of printout.children) {\r\n        if (child.classList.contains(\"sidebyside\")) {\r\n            rows.push(child);\r\n        } else if (child.querySelector(\".task\")) {\r\n            rows.push(child);\r\n            const tasks = child.querySelectorAll(\".task, .conclusion\");\r\n\r\n            for (let i = 0; i < tasks.length; i++) {\r\n                let parent = tasks[i].parentElement;\r\n                let grandparent = parent.parentElement;\r\n                if (grandparent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subsubtask\");\r\n                } else if (parent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subtask\");\r\n                }\r\n            }\r\n            for (let i = tasks.length - 1; i > 0; i--) {\r\n                printout.insertBefore(tasks[i], child.nextSibling);\r\n            }\r\n        } else {\r\n            rows.push(child);\r\n        }\r\n    }\r\n\r\n    // Build block list with height info\r\n    let blockList = [];\r\n    for (const row of rows) {\r\n        let blockHeight = getElementTotalHeight(row);\r\n        if (blockHeight === 0) continue;\r\n\r\n        let totalWorkspaceHeight = 0;\r\n        if (row.querySelector(\".workspace\")) {\r\n            totalWorkspaceHeight = getElemWorkspaceHeight(row);\r\n        }\r\n        blockList.push({\r\n            elem: row,\r\n            height: blockHeight,\r\n            workspaceHeight: totalWorkspaceHeight,\r\n        });\r\n    }\r\n\r\n    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);\r\n\r\n    // Create page divs\r\n    for (let i = 0; i < pageBreaks.length; i++) {\r\n        const pageDiv = document.createElement(\"section\");\r\n        pageDiv.classList.add(\"onepage\");\r\n        if (i === 0) pageDiv.classList.add(\"firstpage\");\r\n        if (i === pageBreaks.length - 1) pageDiv.classList.add(\"lastpage\");\r\n\r\n        const start = pageBreaks[i - 1] || 0;\r\n        const end = pageBreaks[i];\r\n        for (let j = start; j < end; j++) {\r\n            pageDiv.appendChild(blockList[j].elem);\r\n        }\r\n        printout.appendChild(pageDiv);\r\n    }\r\n\r\n    // Remove content not in a page\r\n    for (const child of Array.from(printout.children)) {\r\n        if (!child.classList.contains(\"onepage\")) {\r\n            printout.removeChild(child);\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview header and footer management.\r\n *\r\n * Adds editable header/footer divs to each page, populates them from\r\n * localStorage or data attributes, and persists edits back to localStorage.\r\n */\r\n\r\nexport function addHeadersAndFootersToPrintout() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    pages.forEach((page, index) => {\r\n        const isFirstPage = index === 0;\r\n\r\n        const headerDiv = document.createElement(\"div\");\r\n        headerDiv.classList.add(\r\n            isFirstPage ? \"first-page-header\" : \"running-header\",\r\n            \"hidden\"\r\n        );\r\n        headerDiv.innerHTML = `<div class=\"header-left\" contenteditable=\"true\"></div><div class=\"header-center\" contenteditable=\"true\"></div><div class=\"header-right\" contenteditable=\"true\"></div>`;\r\n        page.insertBefore(headerDiv, page.firstChild);\r\n\r\n        const footerDiv = document.createElement(\"div\");\r\n        footerDiv.classList.add(\r\n            isFirstPage ? \"first-page-footer\" : \"running-footer\",\r\n            \"hidden\"\r\n        );\r\n        footerDiv.innerHTML = `<div class=\"footer-left\" contenteditable=\"true\"></div><div class=\"footer-center\" contenteditable=\"true\"></div><div class=\"footer-right\" contenteditable=\"true\"></div>`;\r\n        page.appendChild(footerDiv);\r\n    });\r\n\r\n    // Populate from localStorage or data attributes\r\n    const keys = [\r\n        \"header-first-left\",\r\n        \"header-first-center\",\r\n        \"header-first-right\",\r\n        \"footer-first-left\",\r\n        \"footer-first-center\",\r\n        \"footer-first-right\",\r\n        \"header-running-left\",\r\n        \"header-running-center\",\r\n        \"header-running-right\",\r\n        \"footer-running-left\",\r\n        \"footer-running-center\",\r\n        \"footer-running-right\",\r\n    ];\r\n\r\n    const content = {};\r\n    keys.forEach((key) => {\r\n        content[key] =\r\n            localStorage.getItem(key) ||\r\n            printout.getAttribute(`data-${key}`) ||\r\n            \"\";\r\n    });\r\n\r\n    // First page\r\n    const firstHeader = document.querySelector(\".first-page-header\");\r\n    if (firstHeader) {\r\n        firstHeader.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-first-left\"];\r\n        firstHeader.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-first-center\"];\r\n        firstHeader.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-first-right\"];\r\n    }\r\n    const firstFooter = document.querySelector(\".first-page-footer\");\r\n    if (firstFooter) {\r\n        firstFooter.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-first-left\"];\r\n        firstFooter.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-first-center\"];\r\n        firstFooter.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-first-right\"];\r\n    }\r\n\r\n    // Running headers and footers\r\n    document.querySelectorAll(\".running-header\").forEach((headerDiv) => {\r\n        headerDiv.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-running-left\"];\r\n        headerDiv.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-running-center\"];\r\n        headerDiv.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-running-right\"];\r\n    });\r\n    document.querySelectorAll(\".running-footer\").forEach((footerDiv) => {\r\n        footerDiv.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-running-left\"];\r\n        footerDiv.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-running-center\"];\r\n        footerDiv.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-running-right\"];\r\n    });\r\n\r\n    // Persist edits to localStorage\r\n    const selectorMap = {\r\n        \"header-first-left\": \".first-page-header .header-left\",\r\n        \"header-first-center\": \".first-page-header .header-center\",\r\n        \"header-first-right\": \".first-page-header .header-right\",\r\n        \"footer-first-left\": \".first-page-footer .footer-left\",\r\n        \"footer-first-center\": \".first-page-footer .footer-center\",\r\n        \"footer-first-right\": \".first-page-footer .footer-right\",\r\n        \"header-running-left\": \".running-header .header-left\",\r\n        \"header-running-center\": \".running-header .header-center\",\r\n        \"header-running-right\": \".running-header .header-right\",\r\n        \"footer-running-left\": \".running-footer .footer-left\",\r\n        \"footer-running-center\": \".running-footer .footer-center\",\r\n        \"footer-running-right\": \".running-footer .footer-right\",\r\n    };\r\n    keys.forEach((key) => {\r\n        const elements = document.querySelectorAll(selectorMap[key]);\r\n        elements.forEach((elem) => {\r\n            elem.addEventListener(\"input\", () => {\r\n                localStorage.setItem(key, elem.innerHTML);\r\n            });\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Paper size detection.\r\n *\r\n * Determines paper size (letter vs a4) from localStorage, or falls back\r\n * to geographic detection via ipapi.co.\r\n */\r\n\r\nexport function getPaperSize() {\r\n    let paperSize = localStorage.getItem(\"papersize\");\r\n    if (paperSize) return paperSize;\r\n\r\n    // Try to set papersize based on user's geographic region\r\n    try {\r\n        fetch(\"https://ipapi.co/json/\")\r\n            .then((response) => response.json())\r\n            .then((data) => {\r\n                const continent =\r\n                    data && data.continent_code ? data.continent_code : \"\";\r\n                paperSize =\r\n                    continent === \"NA\" || continent === \"SA\"\r\n                        ? \"letter\"\r\n                        : \"a4\";\r\n                const radio = document.querySelector(\r\n                    `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n                );\r\n                if (radio) {\r\n                    radio.checked = true;\r\n                    localStorage.setItem(\"papersize\", paperSize);\r\n                }\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(paperSize);\r\n            })\r\n            .catch((err) => {\r\n                throw err;\r\n            });\r\n    } catch (e) {\r\n        const radio = document.querySelector(\r\n            'input[name=\"papersize\"][value=\"letter\"]'\r\n        );\r\n        if (radio) radio.checked = true;\r\n    }\r\n    return paperSize || \"letter\";\r\n}\r\n", "/**\r\n * Printout section loading (print preview).\r\n *\r\n * Swaps the current page content with the target printable section\r\n * and switches to the print-worksheet stylesheet.\r\n */\r\n\r\nexport async function loadPrintout(printableSectionID) {\r\n    const themeStylesheetLink = document.querySelector(\r\n        'link[rel=\"stylesheet\"][href*=\"theme\"]'\r\n    );\r\n    const themeStylesheetHref = themeStylesheetLink\r\n        ? themeStylesheetLink.getAttribute(\"href\")\r\n        : null;\r\n\r\n    if (themeStylesheetHref) {\r\n        const printStylesheetHref = themeStylesheetHref.replace(\r\n            /theme.*\\.css/,\r\n            \"print-worksheet.css\"\r\n        );\r\n        themeStylesheetLink.setAttribute(\"href\", printStylesheetHref);\r\n        await new Promise((resolve) => {\r\n            themeStylesheetLink.addEventListener(\"load\", resolve, {\r\n                once: true,\r\n            });\r\n        });\r\n    }\r\n\r\n    const printableSection = document.getElementById(printableSectionID);\r\n    if (!printableSection) {\r\n        console.error(\"No section found with ID:\", printableSectionID);\r\n        return;\r\n    }\r\n\r\n    const ptxContent = document.querySelector(\".ptx-content\");\r\n    const existingSections = ptxContent.querySelectorAll(\":scope > section\");\r\n    existingSections.forEach((sec) => ptxContent.removeChild(sec));\r\n    ptxContent.appendChild(printableSection);\r\n}\r\n", "/**\r\n * Solution rewriting for print preview.\r\n *\r\n * Converts <details>/<summary> solution elements into plain <div>s\r\n * with a heading, so they render properly in print layout.\r\n */\r\n\r\nexport function rewriteSolutions() {\r\n    const bornHiddenKnowls = document.querySelectorAll(\r\n        \".worksheet details, .handout details\"\r\n    );\r\n    bornHiddenKnowls.forEach(function (detail) {\r\n        const summary = detail.querySelector(\"summary\");\r\n        const content = detail.innerHTML.replace(summary.outerHTML, \"\");\r\n        const div = document.createElement(\"div\");\r\n        div.classList = detail.classList;\r\n        if (summary) {\r\n            const title = document.createElement(\"h5\");\r\n            title.innerHTML = summary.innerHTML;\r\n            div.appendChild(title);\r\n        }\r\n        const body = document.createElement(\"div\");\r\n        body.innerHTML = content;\r\n        div.appendChild(body);\r\n        detail.parentNode.replaceChild(div, detail);\r\n    });\r\n}\r\n", "/**\r\n * Print-preview initialization and controls.\r\n *\r\n * Orchestrates the print-preview workflow: loading the printout section,\r\n * setting up paper size controls, managing solution visibility, creating\r\n * or adjusting pages, and wiring up header/footer toggles.\r\n */\r\n\r\nimport { toPixels, setPageGeometryCSS } from \"./geometry.js\";\r\nimport {\r\n    adjustWorkspaceToFitPage,\r\n    toggleWorkspaceHighlight,\r\n} from \"./workspace.js\";\r\nimport {\r\n    flattenParagraphsSections,\r\n    waitForImages,\r\n    adjustPrintoutPages,\r\n    createPrintoutPages,\r\n} from \"./pages.js\";\r\nimport { addHeadersAndFootersToPrintout } from \"./headers-footers.js\";\r\nimport { getPaperSize } from \"./paper-size.js\";\r\nimport { loadPrintout } from \"./section-swap.js\";\r\nimport { rewriteSolutions } from \"./solutions.js\";\r\n\r\nexport async function initPrintPreview() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"printpreview\")) return;\r\n\r\n    const printableSectionID = urlParams.get(\"printpreview\");\r\n    await loadPrintout(printableSectionID);\r\n\r\n    // Parse margins\r\n    const marginList = document\r\n        .querySelector(\"section.worksheet, section.handout\")\r\n        .getAttribute(\"data-margins\")\r\n        .split(\" \");\r\n    const margins = {\r\n        top: toPixels(marginList[0] || \"0.75in\"),\r\n        right: toPixels(marginList[1] || \"0.75in\"),\r\n        bottom: toPixels(marginList[2] || \"0.75in\"),\r\n        left: toPixels(marginList[3] || \"0.75in\"),\r\n    };\r\n\r\n    rewriteSolutions();\r\n\r\n    // Paper size setup\r\n    let paperSize = getPaperSize();\r\n    if (paperSize) {\r\n        const radio = document.querySelector(\r\n            `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n        );\r\n        if (radio) radio.checked = true;\r\n        document.body.classList.remove(\"a4\", \"letter\");\r\n        document.body.classList.add(paperSize);\r\n        setPageGeometryCSS({ paperSize, margins });\r\n    }\r\n\r\n    // Paper size radio change handlers\r\n    const papersizeRadios = document.querySelectorAll(\r\n        'input[name=\"papersize\"]'\r\n    );\r\n    papersizeRadios.forEach((radio) => {\r\n        radio.addEventListener(\"change\", function () {\r\n            if (this.checked) {\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(this.value);\r\n                localStorage.setItem(\"papersize\", this.value);\r\n                setPageGeometryCSS({ paperSize: this.value, margins });\r\n                adjustWorkspaceToFitPage({\r\n                    paperSize: this.value,\r\n                    margins,\r\n                });\r\n            }\r\n        });\r\n    });\r\n\r\n    // Solution visibility checkboxes\r\n    for (const solutionType of [\"hint\", \"answer\", \"solution\"]) {\r\n        const checkbox = document.getElementById(\r\n            `hide-${solutionType}-checkbox`\r\n        );\r\n        if (!checkbox) continue;\r\n\r\n        const storageKey = `hide-${solutionType}`;\r\n        if (\r\n            (solutionType === \"answer\" || solutionType === \"solution\") &&\r\n            !localStorage.getItem(storageKey)\r\n        ) {\r\n            checkbox.checked = true;\r\n            localStorage.setItem(storageKey, \"true\");\r\n        }\r\n\r\n        checkbox.checked = localStorage.getItem(storageKey) === \"true\";\r\n        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.add(\"hidden\");\r\n            } else {\r\n                elem.classList.remove(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(storageKey, this.checked);\r\n            document\r\n                .querySelectorAll(`div.${solutionType}`)\r\n                .forEach((elem) => {\r\n                    if (checkbox.checked) {\r\n                        elem.classList.add(\"hidden\");\r\n                    } else {\r\n                        elem.classList.remove(\"hidden\");\r\n                    }\r\n                    adjustWorkspaceToFitPage({ paperSize, margins });\r\n                });\r\n        });\r\n    }\r\n\r\n    // Build pages\r\n    const printoutSection = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (printoutSection) {\r\n        flattenParagraphsSections(printoutSection);\r\n        await waitForImages(printoutSection);\r\n    }\r\n\r\n    if (document.querySelector(\".onepage\")) {\r\n        adjustPrintoutPages();\r\n    } else {\r\n        createPrintoutPages(margins);\r\n    }\r\n\r\n    addHeadersAndFootersToPrintout();\r\n\r\n    // Header/footer toggle checkboxes\r\n    for (const hf of [\r\n        \"first-page-header\",\r\n        \"running-header\",\r\n        \"first-page-footer\",\r\n        \"running-footer\",\r\n    ]) {\r\n        const checkbox = document.getElementById(`print-${hf}-checkbox`);\r\n        if (!checkbox) continue;\r\n\r\n        checkbox.checked =\r\n            localStorage.getItem(`print-${hf}`) === \"true\";\r\n        document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.remove(\"hidden\");\r\n            } else {\r\n                elem.classList.add(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(`print-${hf}`, this.checked);\r\n            document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n                if (checkbox.checked) {\r\n                    elem.classList.remove(\"hidden\");\r\n                } else {\r\n                    elem.classList.add(\"hidden\");\r\n                }\r\n                adjustWorkspaceToFitPage({ paperSize, margins });\r\n            });\r\n        });\r\n    }\r\n\r\n    // Adjust workspace heights\r\n    adjustWorkspaceToFitPage({ paperSize, margins });\r\n\r\n    // Highlight workspace checkbox\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    if (highlightCheckbox) {\r\n        highlightCheckbox.checked =\r\n            localStorage.getItem(\"highlightWorkspace\") === \"true\";\r\n        highlightCheckbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(\"highlightWorkspace\", this.checked);\r\n            toggleWorkspaceHighlight(this.checked);\r\n        });\r\n        toggleWorkspaceHighlight(highlightCheckbox.checked);\r\n    }\r\n}\r\n", "/**\r\n * Dark/light mode switching.\r\n *\r\n * Detects user preference via localStorage or `prefers-color-scheme`,\r\n * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.\r\n */\r\n\r\nexport function isDarkMode() {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return false;\r\n\r\n    const currentTheme = localStorage.getItem(\"theme\");\r\n    if (currentTheme === \"dark\") return true;\r\n    if (currentTheme === \"light\") return false;\r\n\r\n    return (\r\n        window.matchMedia &&\r\n        window.matchMedia(\"(prefers-color-scheme: dark)\").matches\r\n    );\r\n}\r\n\r\nexport function setDarkMode(isDark) {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return;\r\n\r\n    const parentHtml = document.documentElement;\r\n    const iframes = document.querySelectorAll(\r\n        \"iframe[data-dark-mode-enabled]\"\r\n    );\r\n\r\n    if (isDark) {\r\n        parentHtml.classList.add(\"dark-mode\");\r\n    } else {\r\n        parentHtml.classList.remove(\"dark-mode\");\r\n    }\r\n\r\n    // Sync each iframe's <html> class with the parent\r\n    for (const iframe of iframes) {\r\n        try {\r\n            const iframeHtml = iframe.contentWindow.document.documentElement;\r\n            if (isDark) {\r\n                iframeHtml.classList.add(\"dark-mode\");\r\n            } else {\r\n                iframeHtml.classList.remove(\"dark-mode\");\r\n            }\r\n        } catch (err) {\r\n            console.warn(\"Dark mode sync to iframe failed:\", err);\r\n        }\r\n    }\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.querySelector(\".icon\").innerText = isDark\r\n            ? \"light_mode\"\r\n            : \"dark_mode\";\r\n        modeButton.querySelector(\".name\").innerText = isDark\r\n            ? \"Light Mode\"\r\n            : \"Dark Mode\";\r\n    }\r\n}\r\n\r\nexport function initThemeToggle() {\r\n    // Run immediately to avoid flicker\r\n    setDarkMode(isDarkMode());\r\n\r\n    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)\r\n    const isDark = isDarkMode();\r\n    setDarkMode(isDark);\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.addEventListener(\"click\", function () {\r\n            const wasDark = isDarkMode();\r\n            setDarkMode(!wasDark);\r\n            localStorage.setItem(\"theme\", wasDark ? \"light\" : \"dark\");\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * Embed/share button and embed-mode display.\r\n *\r\n * Provides the \"embed in LMS\" button that copies an <iframe> snippet,\r\n * and strips chrome when the page is loaded in embed mode (?embed).\r\n */\r\n\r\nimport { setDarkMode } from \"./theme.js\";\r\n\r\nexport function initShareButton() {\r\n    const shareButton = document.getElementById(\"embed-button\");\r\n    if (!shareButton) return;\r\n\r\n    const sharePopup = document.getElementById(\"embed-popup\");\r\n    const embedCode =\r\n        \"<iframe src='\" +\r\n        window.location.href +\r\n        \"?embed' width='100%' height='1000px' frameborder='0'></iframe>\";\r\n    const embedTextbox = document.getElementById(\"embed-code-textbox\");\r\n    if (embedTextbox) {\r\n        embedTextbox.value = embedCode;\r\n    }\r\n\r\n    shareButton.addEventListener(\"click\", function () {\r\n        sharePopup.classList.toggle(\"hidden\");\r\n    });\r\n\r\n    const copyButton = document.getElementById(\"copy-embed-button\");\r\n    if (copyButton) {\r\n        copyButton.addEventListener(\"click\", function () {\r\n            const textbox = document.getElementById(\"embed-code-textbox\");\r\n            if (textbox) {\r\n                navigator.clipboard\r\n                    .writeText(embedCode)\r\n                    .then(() => {\r\n                        console.log(\"Embed code copied to clipboard!\");\r\n                    })\r\n                    .catch((err) => {\r\n                        console.error(\"Failed to copy embed code: \", err);\r\n                    });\r\n                copyButton.querySelector(\".icon\").innerText =\r\n                    \"library_add_check\";\r\n                setTimeout(function () {\r\n                    copyButton.querySelector(\".icon\").innerText =\r\n                        \"content_copy\";\r\n                    sharePopup.classList.add(\"hidden\");\r\n                }, 450);\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initEmbedMode() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"embed\")) return;\r\n\r\n    // Set dark mode based on value of param\r\n    if (urlParams.get(\"embed\") === \"dark\") {\r\n        setDarkMode(true);\r\n    } else {\r\n        setDarkMode(false);\r\n    }\r\n\r\n    const elemsToHide = [\r\n        \"ptx-navbar\",\r\n        \"ptx-masthead\",\r\n        \"ptx-page-footer\",\r\n        \"ptx-sidebar\",\r\n        \"ptx-content-footer\",\r\n    ];\r\n    for (const id of elemsToHide) {\r\n        const elem = document.getElementById(id);\r\n        if (elem) {\r\n            elem.classList.add(\"hidden\");\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Code block copy-to-clipboard button.\r\n *\r\n * Wraps `.clipboardable` elements with a container and injects a copy\r\n * button.  Clicking the button copies the `<pre>` content.\r\n */\r\n\r\nexport function initCodeCopyButtons() {\r\n    const elements = document.querySelectorAll(\".clipboardable\");\r\n    for (const el of elements) {\r\n        const div = document.createElement(\"div\");\r\n        div.classList.add(\"clipboardable\");\r\n        el.classList.remove(\"clipboardable\");\r\n        el.replaceWith(div);\r\n        div.insertAdjacentElement(\"afterbegin\", el);\r\n        div.insertAdjacentHTML(\r\n            \"beforeend\",\r\n            `\r\n    <button class=\"code-copy\" title=\"Copy code\" role=\"button\" aria-label=\"Copy code\" >\r\n        <span class=\"copyicon material-symbols-outlined\">content_copy</span>\r\n        <span class=\"checkmark material-symbols-outlined\">check</span>\r\n    </button>\r\n            `.trim()\r\n        );\r\n    }\r\n}\r\n\r\nexport function initCodeCopyHandler() {\r\n    document.addEventListener(\"click\", (ev) => {\r\n        const codeBox = ev.target.closest(\".clipboardable\");\r\n        if (!navigator.clipboard || !codeBox) return;\r\n        const button = ev.target.closest(\".code-copy\");\r\n        if (!button) return;\r\n        const preContent = codeBox.querySelector(\"pre\").textContent;\r\n        navigator.clipboard.writeText(preContent);\r\n        button.classList.toggle(\"copied\");\r\n        setTimeout(() => button.classList.toggle(\"copied\"), 1000);\r\n    });\r\n}\r\n", "/**\r\n * Auto-ID generation for paragraphs without IDs.\r\n *\r\n * \u26A0\uFE0F DEPRECATED / SUSPICIOUS: Generates IDs like \"base-id-part2\", \"base-id-part3\"\r\n * for <p> elements that lack an id, based on the nearest preceding <p> that has one.\r\n * Produces heavy console.log output. It is unclear whether any downstream code\r\n * depends on the generated IDs.\r\n */\r\n\r\nexport function initAutoId() {\r\n    const noIdParagraphs = document.querySelectorAll(\".main p:not([id])\");\r\n    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {\r\n        const e = noIdParagraphs[n];\r\n        if (e.hasAttribute(\"id\")) continue;\r\n        if (e.classList.contains(\"watermark\")) continue;\r\n\r\n        // Find all preceding sibling <p> elements\r\n        const prevParagraphs = [];\r\n        let sibling = e.previousElementSibling;\r\n        while (sibling) {\r\n            if (sibling.tagName === \"P\") {\r\n                prevParagraphs.push(sibling);\r\n            }\r\n            sibling = sibling.previousElementSibling;\r\n        }\r\n\r\n        if (prevParagraphs.length === 0) continue;\r\n\r\n        let partsFound = 1;\r\n        const partsToId = [e];\r\n        for (let i = 0; i < prevParagraphs.length; ++i) {\r\n            const thisPrevious = prevParagraphs[i];\r\n            if (!thisPrevious.hasAttribute(\"id\")) {\r\n                partsToId.unshift(thisPrevious);\r\n            } else {\r\n                const baseId = thisPrevious.id;\r\n                for (let j = 0; j < partsToId.length; ++j) {\r\n                    ++partsFound;\r\n                    const nextId = baseId + \"-part\" + partsFound.toString();\r\n                    partsToId[j].setAttribute(\"id\", nextId);\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Video magnification (resize YouTube iframes to full browser width).\r\n *\r\n * \u26A0\uFE0F DEAD CODE: The selector `body iframeXXXX` intentionally matches no\r\n * elements.  This module is preserved for reference but has no effect.\r\n */\r\n\r\nexport function initVideoMagnify() {\r\n    const allIframes = document.querySelectorAll(\"body iframeXXXX\");\r\n    for (let i = 0; i < allIframes.length; i++) {\r\n        const thisItem = allIframes[i];\r\n        const thisItemSrc = thisItem.src;\r\n        if (!thisItemSrc.includes(\"youtube\")) continue;\r\n\r\n        const thisItemId = thisItem.id;\r\n        const thisItemWidth = thisItem.width;\r\n        const thisItemHeight = thisItem.height;\r\n        if (thisItemHeight < 150) continue;\r\n\r\n        const emptyDiv = document.createElement(\"div\");\r\n        const videomagContainer = document.createElement(\"div\");\r\n        const parentTag = thisItem.parentElement.tagName;\r\n        if (parentTag === \"FIGURE\") {\r\n            videomagContainer.setAttribute(\"class\", \"videobig\");\r\n        } else {\r\n            videomagContainer.setAttribute(\"class\", \"videobig nofigure\");\r\n        }\r\n        videomagContainer.setAttribute(\"video-id\", thisItemId);\r\n        videomagContainer.setAttribute(\"data-width\", thisItemWidth);\r\n        videomagContainer.setAttribute(\"data-height\", thisItemHeight);\r\n        videomagContainer.innerHTML = \"fit width\";\r\n\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", videomagContainer);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n    }\r\n\r\n    // Toggle handlers\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const bigBtn = event.target.closest(\".videobig\");\r\n        if (bigBtn) {\r\n            const videoId = bigBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = parseInt(bigBtn.getAttribute(\"data-width\"));\r\n            const originalHeight = parseInt(bigBtn.getAttribute(\"data-height\"));\r\n            const browserWidth = window.innerWidth;\r\n            const widthRatio = browserWidth / originalWidth;\r\n\r\n            video.setAttribute(\"width\", widthRatio * originalWidth);\r\n            video.setAttribute(\"height\", widthRatio * originalHeight);\r\n            video.setAttribute(\r\n                \"style\",\r\n                \"position:relative; 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diff --git a/js/jquery.min.js b/js/jquery.min.js
new file mode 100644
index 000000000..7f37b5d99
--- /dev/null
+++ b/js/jquery.min.js
@@ -0,0 +1,2 @@
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diff --git a/js/src/pretext-core-entry.js b/js/src/pretext-core-entry.js
index 7f7b750e6..eb8cce4f3 100644
--- a/js/src/pretext-core-entry.js
+++ b/js/src/pretext-core-entry.js
@@ -28,6 +28,10 @@ import { initVideoMagnify } from "./deprecated/video-magnify.js";
 // Run dark mode immediately to avoid flash of wrong theme
 setDarkMode(isDarkMode());
 
+// Expose theme functions globally for inline scripts (e.g., mermaid init in XSL)
+window.isDarkMode = isDarkMode;
+window.setDarkMode = setDarkMode;
+
 // --- DOMContentLoaded handlers ---
 window.addEventListener("DOMContentLoaded", function () {
     // TOC and sidebar
diff --git a/xsl/pretext-runestone.xsl b/xsl/pretext-runestone.xsl
index 16338fb37..cbc94563b 100644
--- a/xsl/pretext-runestone.xsl
+++ b/xsl/pretext-runestone.xsl
@@ -223,6 +223,10 @@ along with PreTeXt.  If not, see <http://www.gnu.org/licenses/>.
     <!-- Javascript and CSS "master" links/pointers into _static -->
     <xsl:comment>*** Runestone Services ***</xsl:comment>
     <xsl:text>&#xa;</xsl:text>
+    <!-- Runestone components require jQuery globally -->
+    <xsl:if test="$rs-js-tokens">
+        <script src="{$html.js.dir}/jquery.min.js"></script>
+    </xsl:if>
     <xsl:for-each select="$rs-js-tokens">
         <script>
             <xsl:attribute name="src">

From 7d32b932aaa37815ae1c2dbb1ed72ab6b5185556 Mon Sep 17 00:00:00 2001
From: Oscar Levin <oscar.levin@unco.edu>
Date: Thu, 2 Apr 2026 13:04:46 -0600
Subject: [PATCH 12/12] Guard against null summary in born-hidden-knowl init

Print preview rewrites <details> born-hidden-knowl elements into <div>s
(removing <summary>), but keeps the class. When initKnowls() later
queries for .born-hidden-knowl > summary, it gets null and crashes.
Skip elements that have already been rewritten.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 js/dist/pretext-core.js     | 1 +
 js/dist/pretext-core.js.map | 4 ++--
 js/src/knowl.js             | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/js/dist/pretext-core.js b/js/dist/pretext-core.js
index 1af87ebee..5f3828fa0 100644
--- a/js/dist/pretext-core.js
+++ b/js/dist/pretext-core.js
@@ -427,6 +427,7 @@
     const bornHiddens = target.querySelectorAll(".born-hidden-knowl");
     for (const bhk of bornHiddens) {
       const summary = bhk.querySelector(":scope > summary");
+      if (!summary) continue;
       const contents = bhk.querySelector(":scope > summary + *");
       new SlideRevealer(summary, contents, bhk);
     }
diff --git a/js/dist/pretext-core.js.map b/js/dist/pretext-core.js.map
index 4e1c2fa01..bef08ec77 100644
--- a/js/dist/pretext-core.js.map
+++ b/js/dist/pretext-core.js.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["../src/toc.js", "../src/knowl.js", "../src/lti-iframe-resizer.js", "../src/permalink.js", "../src/image-magnify.js", "../src/deprecated/scrollbar-width.js", "../src/geogebra.js", "../src/keyboard-nav.js", "../src/print-preview/geometry.js", "../src/print-preview/workspace.js", "../src/print-preview/page-breaks.js", "../src/print-preview/pages.js", "../src/print-preview/headers-footers.js", "../src/print-preview/paper-size.js", "../src/print-preview/section-swap.js", "../src/print-preview/solutions.js", "../src/print-preview/index.js", "../src/theme.js", "../src/embed.js", "../src/code-copy.js", "../src/deprecated/auto-id.js", "../src/deprecated/video-magnify.js", "../src/pretext-core-entry.js"],
-  "sourcesContent": ["/**\r\n * TOC, sidebar, and navigation (from pretext.js).\r\n *\r\n * Manages the table-of-contents sidebar: scroll-to-active, toggle\r\n * visibility, auto-collapse, focused/expandable TOC items, and\r\n * hash-based navigation.\r\n */\r\n\r\nfunction getOffsetTop(e) {\r\n    if (!e) return 0;\r\n    return getOffsetTop(e.offsetParent) + e.offsetTop;\r\n}\r\n\r\nfunction scrollTocToActive() {\r\n    let fileNameWHash = window.location.href.split(\"/\").pop();\r\n    let fileName = fileNameWHash.split(\"#\")[0];\r\n\r\n    let tocEntry = document.querySelector(\r\n        '#ptx-toc a[href=\"' + fileName + '\"]'\r\n    );\r\n    if (!tocEntry) return;\r\n\r\n    let tocEntryTop = 0;\r\n    if (fileNameWHash.includes(\"#\")) {\r\n        let tocEntryWHash = document.querySelector(\r\n            '#ptx-toc a[href=\"' + fileNameWHash + '\"]'\r\n        );\r\n        if (tocEntryWHash) {\r\n            tocEntry\r\n                .closest(\"li\")\r\n                .querySelectorAll(\"li\")\r\n                .forEach((li) => {\r\n                    li.classList.remove(\"active\");\r\n                });\r\n            tocEntryWHash.closest(\"li\").classList.add(\"active\");\r\n            tocEntryTop = getOffsetTop(tocEntryWHash);\r\n        }\r\n    }\r\n    if (!tocEntryTop) {\r\n        tocEntryTop = getOffsetTop(tocEntry);\r\n    }\r\n\r\n    tocEntry.closest(\"li\").classList.add(\"active\");\r\n    let toc = document.querySelector(\"#ptx-toc\");\r\n    let tocTop = getOffsetTop(toc);\r\n    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;\r\n}\r\n\r\nfunction toggletoc() {\r\n    const thesidebar = document.getElementById(\"ptx-sidebar\");\r\n    if (\r\n        thesidebar.classList.contains(\"hidden\") ||\r\n        thesidebar.classList.contains(\"visible\")\r\n    ) {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else if (thesidebar.offsetParent === null) {\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n    }\r\n    scrollTocToActive();\r\n}\r\n\r\nfunction samePageLink(a) {\r\n    if (!(a instanceof HTMLAnchorElement)) return false;\r\n    try {\r\n        const linkUrl = new URL(a.href, document.baseURI);\r\n        const currentUrl = new URL(window.location.href);\r\n        const sameDocument =\r\n            linkUrl.origin === currentUrl.origin &&\r\n            linkUrl.pathname === currentUrl.pathname &&\r\n            linkUrl.search === currentUrl.search;\r\n        return sameDocument && !!linkUrl.hash;\r\n    } catch (e) {\r\n        return false;\r\n    }\r\n}\r\n\r\nfunction getTOCItemType(item) {\r\n    for (let className of item.classList) {\r\n        if (\r\n            className !== \"toc-item\" &&\r\n            className.length > 3 &&\r\n            className.slice(0, 4) === \"toc-\"\r\n        )\r\n            return className.slice(4);\r\n    }\r\n    return \"\";\r\n}\r\n\r\nfunction getTOCItemDepth(item) {\r\n    let depth = 0;\r\n    let curParent = item.closest(\".toc-item-list\");\r\n    while (curParent !== null) {\r\n        depth++;\r\n        curParent = curParent.parentElement.closest(\".toc-item-list\");\r\n    }\r\n    return depth;\r\n}\r\n\r\nfunction toggleTOCItem(expander) {\r\n    let listItem = expander.closest(\".toc-item\");\r\n    listItem.classList.toggle(\"expanded\");\r\n    let expanded = listItem.classList.contains(\"expanded\");\r\n    let itemType = getTOCItemType(listItem);\r\n\r\n    if (expanded) {\r\n        expander.title = \"Close\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    } else {\r\n        expander.title = \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    }\r\n\r\n    for (const childUL of listItem.querySelectorAll(\r\n        \":scope > ul.toc-item-list\"\r\n    )) {\r\n        for (const childItem of childUL.querySelectorAll(\r\n            \":scope > li.toc-item\"\r\n        )) {\r\n            if (expanded) {\r\n                childItem.classList.add(\"visible\");\r\n                childItem.classList.remove(\"hidden\");\r\n            } else {\r\n                childItem.classList.remove(\"visible\");\r\n                childItem.classList.add(\"hidden\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initToc() {\r\n    const thetocbutton = document.getElementsByClassName(\"toc-toggle\")[0];\r\n    if (thetocbutton) {\r\n        thetocbutton.addEventListener(\"click\", (e) => {\r\n            toggletoc();\r\n            e.stopPropagation();\r\n        });\r\n    }\r\n\r\n    // Auto-collapse TOC when clicking outside\r\n    if (\r\n        getComputedStyle(document.documentElement).getPropertyValue(\r\n            \"--auto-collapse-toc\"\r\n        ) == \"yes\"\r\n    ) {\r\n        const sidebar = document.getElementById(\"ptx-sidebar\");\r\n\r\n        window.addEventListener(\"click\", function (event) {\r\n            if (sidebar.classList.contains(\"visible\")) {\r\n                if (!event.composedPath().includes(sidebar)) {\r\n                    toggletoc();\r\n                }\r\n            }\r\n        });\r\n\r\n        sidebar.addEventListener(\"click\", function (event) {\r\n            if (samePageLink(event.target.closest(\"a\"))) {\r\n                toggletoc();\r\n            }\r\n        });\r\n\r\n        window.addEventListener(\"pageshow\", (e) => {\r\n            if (e.persisted) {\r\n                sidebar.classList.remove(\"visible\");\r\n                sidebar.classList.add(\"hidden\");\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initFocusedToc() {\r\n    if (document.querySelector(\".ptx-toc.focused\") === null) return;\r\n\r\n    let maxDepth = 1000;\r\n    for (let className of document.querySelector(\".ptx-toc\").classList)\r\n        if (className.length > 5 && className.slice(0, 5) === \"depth\")\r\n            maxDepth = Number(className.slice(5));\r\n\r\n    let preexpandedLevels = 1;\r\n    let tocDataSet = document.querySelector(\".ptx-toc\").dataset;\r\n    if (typeof tocDataSet.preexpandedLevels !== \"undefined\")\r\n        preexpandedLevels = Number(tocDataSet.preexpandedLevels);\r\n\r\n    let tocItems = document.querySelectorAll(\r\n        \".ptx-toc ul.structural > .toc-item\"\r\n    );\r\n    for (const tocItem of tocItems) {\r\n        let hasChildren =\r\n            tocItem.querySelector(\"ul.structural\") !== null;\r\n        let depth = getTOCItemDepth(tocItem);\r\n\r\n        if (hasChildren && depth < maxDepth) {\r\n            let expander = document.createElement(\"button\");\r\n            expander.classList.add(\"toc-expander\");\r\n            expander.classList.add(\"toc-chevron-surround\");\r\n            expander.title = \"toc-expander\";\r\n            expander.innerHTML =\r\n                '<span class=\"icon material-symbols-outlined\" aria-hidden=\"true\"></span>';\r\n            tocItem.querySelector(\".toc-title-box\").append(expander);\r\n            expander.addEventListener(\"click\", () => {\r\n                toggleTOCItem(expander);\r\n            });\r\n\r\n            let isActive =\r\n                tocItem.classList.contains(\"contains-active\") ||\r\n                tocItem.classList.contains(\"active\");\r\n            let preExpanded = isActive || depth < preexpandedLevels;\r\n            let itemType = getTOCItemType(tocItem);\r\n            if (preExpanded) {\r\n                toggleTOCItem(expander);\r\n            } else {\r\n                expander.title =\r\n                    \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n            }\r\n        }\r\n    }\r\n\r\n    // Expand parents of hash-linked TOC item\r\n    if (window.location.hash) {\r\n        let hash = window.location.hash;\r\n        let hashLink = document.querySelector(\r\n            `.ptx-toc a[href$=\"${hash}\"]`\r\n        );\r\n        if (hashLink) {\r\n            let parentTocItem = hashLink.closest(\".toc-item\");\r\n            while (\r\n                parentTocItem &&\r\n                !parentTocItem.classList.contains(\"contains-active\")\r\n            ) {\r\n                parentTocItem.classList.add(\"contains-active\");\r\n                let expander =\r\n                    parentTocItem.querySelector(\".toc-expander\");\r\n                if (expander) {\r\n                    if (!parentTocItem.classList.contains(\"expanded\")) {\r\n                        toggleTOCItem(expander);\r\n                    }\r\n                }\r\n                parentTocItem =\r\n                    parentTocItem.parentElement.closest(\".toc-item\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initScrollToc() {\r\n    scrollTocToActive();\r\n    window.onhashchange = scrollTocToActive;\r\n}\r\n", "/**\r\n * Knowl behavior (from knowl.js).\r\n *\r\n * Manages xref knowls and born-hidden knowls: click-to-reveal with\r\n * slide animation, lazy content fetching, and MathJax re-typesetting.\r\n */\r\n\r\n// Used to animate both types of knowls\r\nclass SlideRevealer {\r\n    static STATE = Object.freeze({\r\n        INACTIVE: 0,\r\n        CLOSING: 1,\r\n        EXPANDING: 2,\r\n    });\r\n\r\n    constructor(triggerElement, contentElement, animatedElement) {\r\n        this.triggerElement = triggerElement;\r\n        this.contentElement = contentElement;\r\n        this.animatedElement = animatedElement;\r\n\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        this.triggerElement.addEventListener(\"click\", (e) => this.onClick(e));\r\n    }\r\n\r\n    onClick(e) {\r\n        if (e) e.preventDefault();\r\n        this.animatedElement.style.overflow = \"hidden\";\r\n\r\n        if (\r\n            this.animationState === SlideRevealer.STATE.CLOSING ||\r\n            !this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.animatedElement.setAttribute(\"open\", \"\");\r\n            this.triggerElement.setAttribute(\"open\", \"\");\r\n            this.contentElement.style.display = \"\";\r\n            MathJax.typesetPromise().then(() =>\r\n                window.requestAnimationFrame(() => this.toggle(true))\r\n            );\r\n        } else if (\r\n            this.animationState === SlideRevealer.STATE.EXPANDING ||\r\n            this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.toggle(false);\r\n        }\r\n    }\r\n\r\n    toggle(expanding) {\r\n        let closedHeight = 0;\r\n        if (this.animatedElement.contains(this.triggerElement))\r\n            closedHeight = this.triggerElement.offsetHeight;\r\n        const fullHeight = closedHeight + this.contentElement.offsetHeight;\r\n\r\n        const startHeight = `${expanding ? closedHeight : fullHeight}px`;\r\n        const endHeight = `${expanding ? fullHeight : closedHeight}px`;\r\n\r\n        const padding =\r\n            this.animatedElement.offsetHeight -\r\n            this.animatedElement.clientHeight;\r\n        const startPad = `${expanding ? 0 : padding}px`;\r\n        const endPad = `${expanding ? padding : 0}px`;\r\n\r\n        if (this.animation) this.animation.cancel();\r\n\r\n        const animDuration = Math.max(\r\n            Math.min(\r\n                (Math.abs(closedHeight - fullHeight) / 400) * 1000,\r\n                750\r\n            ),\r\n            250\r\n        );\r\n\r\n        this.animationState = expanding\r\n            ? SlideRevealer.STATE.EXPANDING\r\n            : SlideRevealer.STATE.CLOSING;\r\n        this.animation = this.animatedElement.animate(\r\n            {\r\n                height: [startHeight, endHeight],\r\n                paddingTop: [startPad, endPad],\r\n                paddingBottom: [startPad, endPad],\r\n            },\r\n            { duration: animDuration, easing: \"ease\" }\r\n        );\r\n\r\n        this.animation.onfinish = () => {\r\n            this.onAnimationFinish(expanding);\r\n        };\r\n        this.animation.oncancel = () => {\r\n            this.animationState = SlideRevealer.STATE.INACTIVE;\r\n        };\r\n    }\r\n\r\n    onAnimationFinish(isOpen) {\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        if (!isOpen) {\r\n            this.animatedElement.removeAttribute(\"open\");\r\n            this.triggerElement.removeAttribute(\"open\");\r\n        }\r\n\r\n        this.animatedElement.style.overflow = \"\";\r\n        if (!isOpen) this.contentElement.style.display = \"none\";\r\n\r\n        if (isOpen) {\r\n            let hasCallback =\r\n                this.contentElement.querySelectorAll(\r\n                    \"[data-knowl-callback]\"\r\n                );\r\n            hasCallback.forEach((el) => {\r\n                window[el.getAttribute(\"data-knowl-callback\")](el, open);\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nclass LinkKnowl {\r\n    static xrefCount = 0;\r\n\r\n    static initializeXrefKnowl(knowlLinkElement) {\r\n        if (\r\n            knowlLinkElement.getAttribute(\"data-knowl-uid\") === null\r\n        ) {\r\n            return new LinkKnowl(knowlLinkElement);\r\n        }\r\n    }\r\n\r\n    constructor(knowlLinkElement) {\r\n        this.linkElement = knowlLinkElement;\r\n        this.outputElement = null;\r\n        this.uid = LinkKnowl.xrefCount++;\r\n        knowlLinkElement.setAttribute(\"data-knowl-uid\", this.uid);\r\n        knowlLinkElement.setAttribute(\"role\", \"button\");\r\n        knowlLinkElement.setAttribute(\r\n            \"data-base-title\",\r\n            knowlLinkElement.getAttribute(\"title\") ||\r\n                this.linkElement.textContent\r\n        );\r\n        knowlLinkElement.classList.add(\"knowl__link\");\r\n        this.updateLabels(false);\r\n        knowlLinkElement.addEventListener(\r\n            \"click\",\r\n            this.handleLinkClick.bind(this)\r\n        );\r\n    }\r\n\r\n    updateLabels(isVisible) {\r\n        const verb = isVisible\r\n            ? this.linkElement.getAttribute(\"data-close-label\") || \"Close\"\r\n            : this.linkElement.getAttribute(\"data-reveal-label\") ||\r\n              \"Reveal\";\r\n        const targetDescript =\r\n            this.linkElement.getAttribute(\"data-base-title\");\r\n        const helpText = verb + \" \" + targetDescript;\r\n        this.linkElement.setAttribute(\"aria-label\", helpText);\r\n        this.linkElement.setAttribute(\"title\", helpText);\r\n    }\r\n\r\n    toggle() {\r\n        this.linkElement.classList.toggle(\"active\");\r\n        const isActive = this.linkElement.classList.contains(\"active\");\r\n        this.updateLabels(isActive);\r\n\r\n        if (isActive) {\r\n            const h = this.outputElement.getBoundingClientRect().height;\r\n            if (h > window.innerHeight) {\r\n                this.outputElement.scrollIntoView(true);\r\n            } else {\r\n                if (\r\n                    this.outputElement.getBoundingClientRect().bottom >\r\n                    window.innerHeight\r\n                )\r\n                    this.outputElement.scrollIntoView(false);\r\n            }\r\n        }\r\n    }\r\n\r\n    findOutputLocation() {\r\n        const invalidParents =\r\n            \"table, mjx-container, div.tabular-box, .runestone > .parsons\";\r\n        let el = this.linkElement.parentElement;\r\n        let problemAncestor = el.closest(invalidParents);\r\n        while (problemAncestor && problemAncestor !== el) {\r\n            el = problemAncestor;\r\n            problemAncestor = el.closest(invalidParents);\r\n        }\r\n        return el;\r\n    }\r\n\r\n    createOutputElement() {\r\n        const outputId = \"knowl-uid-\" + this.uid;\r\n        const outputContentsId = \"knowl-output-\" + this.uid;\r\n        const linkTarget =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n\r\n        const placeholderText =\r\n            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +\r\n            `Loading '${linkTarget}'` +\r\n            `</div>`;\r\n\r\n        const temp = document.createElement(\"template\");\r\n        temp.innerHTML = placeholderText;\r\n        this.outputElement = temp.content.children[0];\r\n\r\n        const insertLoc = this.findOutputLocation(this.linkElement);\r\n        insertLoc.after(this.outputElement);\r\n    }\r\n\r\n    async getContent() {\r\n        const contentURL =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n        const knowlContent = await fetch(contentURL)\r\n            .then((response) => response.text())\r\n            .then((data) => {\r\n                let knowlDoc = new DOMParser().parseFromString(\r\n                    data,\r\n                    \"text/html\"\r\n                );\r\n                let tempContainer = knowlDoc.body;\r\n                let scripts = knowlDoc.querySelectorAll(\"head script\");\r\n                tempContainer.append(...scripts);\r\n                return tempContainer;\r\n            })\r\n            .catch((error) => {\r\n                const destination =\r\n                    this.linkElement.getAttribute(\"href\");\r\n                const text = this.linkElement.textContent;\r\n                const err_message =\r\n                    `<div class='knowl-output__error'>` +\r\n                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +\r\n                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +\r\n                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href=\"https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally\">PreTeXt FAQ</a> for more information.</div>` +\r\n                    `</div>`;\r\n                return err_message;\r\n            });\r\n        return knowlContent;\r\n    }\r\n\r\n    handleLinkClick(event) {\r\n        event.preventDefault();\r\n\r\n        if (this.outputElement !== null) {\r\n            this.toggle();\r\n        } else {\r\n            this.createOutputElement();\r\n\r\n            const slideHandler = new SlideRevealer(\r\n                this.linkElement,\r\n                this.outputElement,\r\n                this.outputElement\r\n            );\r\n            this.linkElement.addEventListener(\"click\", slideHandler);\r\n\r\n            let loadingTimeout = setTimeout(() => {\r\n                loadingTimeout = null;\r\n                slideHandler.onClick();\r\n                this.toggle();\r\n            }, 500);\r\n\r\n            const content = this.getContent();\r\n\r\n            content\r\n                .then((tempContainer) => {\r\n                    if (loadingTimeout !== null) {\r\n                        clearTimeout(loadingTimeout);\r\n                    }\r\n                    setTimeout(() => {\r\n                        slideHandler.onClick();\r\n                        this.toggle();\r\n                    }, 100);\r\n\r\n                    const runestoneElements =\r\n                        tempContainer.querySelectorAll(\r\n                            \".ptx-runestone-container\"\r\n                        );\r\n                    [...runestoneElements].forEach((e) => {\r\n                        const rsId =\r\n                            e.querySelector(\"[data-component]\")?.id;\r\n                        const onPage = document.getElementById(rsId);\r\n                        if (onPage) {\r\n                            e.innerHTML = `<div class=\"para\">The interactive that belongs here is already on the page and cannot appear multiple times. <a href=\"#${rsId}\">Scroll to interactive.</a>`;\r\n                        } else {\r\n                            window.runestoneComponents.renderOneComponent(\r\n                                e\r\n                            );\r\n                        }\r\n                    });\r\n\r\n                    const children = [...tempContainer.children];\r\n                    this.outputElement.innerHTML = \"\";\r\n                    this.outputElement.append(...children);\r\n\r\n                    addKnowls(this.outputElement);\r\n                    Prism.highlightAllUnder(this.outputElement);\r\n\r\n                    [\r\n                        ...this.outputElement.getElementsByTagName(\r\n                            \"script\"\r\n                        ),\r\n                    ].forEach((s) => {\r\n                        if (\r\n                            s.getAttribute(\"type\") === null ||\r\n                            s.getAttribute(\"type\") ===\r\n                                \"text/javascript\"\r\n                        ) {\r\n                            eval(s.innerHTML);\r\n                        }\r\n                    });\r\n                })\r\n                .catch((data) => {\r\n                    console.log(\r\n                        \"Error fetching knowl content: \" + data\r\n                    );\r\n                });\r\n        }\r\n    }\r\n}\r\n\r\nexport function addKnowls(target) {\r\n    const xrefs = target.querySelectorAll(\"[data-knowl]\");\r\n    for (const xref of xrefs) {\r\n        LinkKnowl.initializeXrefKnowl(xref);\r\n    }\r\n\r\n    const bornHiddens = target.querySelectorAll(\".born-hidden-knowl\");\r\n    for (const bhk of bornHiddens) {\r\n        const summary = bhk.querySelector(\":scope > summary\");\r\n        const contents = bhk.querySelector(\":scope > summary + *\");\r\n        new SlideRevealer(summary, contents, bhk);\r\n    }\r\n}\r\n\r\nexport function initKnowls() {\r\n    addKnowls(document);\r\n}\r\n", "/**\r\n * LTI iframe resizer (from lti_iframe_resizer.js).\r\n *\r\n * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),\r\n * adjusting iframe dimensions based on postMessage events.\r\n *\r\n * @see https://cssplice.org/\r\n */\r\n\r\nexport function sendResizeRequest(el) {\r\n    el.contentWindow.postMessage(\"requestResize\", \"*\");\r\n}\r\n\r\nexport function initLtiIframeResizer() {\r\n    window.addEventListener(\"message\", function (event) {\r\n        let edata = event.data;\r\n\r\n        // MoM sends event.data as a string instead of JSON\r\n        if (\r\n            typeof event.data == \"string\" &&\r\n            event.data.match(/lti\\.frameResize/)\r\n        ) {\r\n            edata = JSON.parse(event.data);\r\n        }\r\n\r\n        if (edata.subject === \"lti.frameResize\") {\r\n            if (\"frame_id\" in edata) {\r\n                const el = document.getElementById(edata[\"frame_id\"]);\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n                if (\r\n                    edata.wrapheight &&\r\n                    document.getElementById(edata[\"frame_id\"] + \"wrap\")\r\n                ) {\r\n                    document.getElementById(\r\n                        edata[\"frame_id\"] + \"wrap\"\r\n                    ).style.height = edata.wrapheight + \"px\";\r\n                }\r\n            } else if (\"iframe_resize_id\" in edata) {\r\n                const el = document.getElementById(\r\n                    edata[\"iframe_resize_id\"]\r\n                );\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n            } else {\r\n                const iFrames =\r\n                    document.getElementsByTagName(\"iframe\");\r\n                for (const iFrame of iFrames) {\r\n                    if (iFrame.contentWindow === event.source) {\r\n                        if (edata.height) {\r\n                            iFrame.height = edata.height;\r\n                            iFrame.style.height = edata.height + \"px\";\r\n                        }\r\n                        if (edata.width) {\r\n                            iFrame.width = edata.width;\r\n                            iFrame.style.width = edata.width + \"px\";\r\n                        }\r\n                        break;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Permalink copy-to-clipboard functionality.\r\n *\r\n * Copies permalink URLs to the clipboard using the Clipboard API,\r\n * with a brief visual confirmation message.\r\n */\r\n\r\nasync function copyPermalink(linkNode) {\r\n    if (!navigator.clipboard) {\r\n        console.log(\"Error: Clipboard API not available\");\r\n        return;\r\n    }\r\n    const elem = linkNode.parentElement;\r\n    if (!linkNode) {\r\n        console.log(\"Error: Something went wrong finding permalink URL\");\r\n        return;\r\n    }\r\n    const url = linkNode.href;\r\n    const description = elem.getAttribute(\"data-description\");\r\n    const link = `<a href=\"${url}\">${description}</a>`;\r\n    const msgLink = `<a class=\"internal\" href=\"${url}\">${description}</a>`;\r\n    const textFallback = description + \" \\r\\n\" + url;\r\n    let copySuccess = true;\r\n\r\n    try {\r\n        // NOTE: this method will only work in Firefox if the user has\r\n        //    dom.events.asyncClipboard.clipboardItem\r\n        // set to true in their about:config.\r\n        await navigator.clipboard.write([\r\n            new ClipboardItem({\r\n                \"text/html\": new Blob([link], { type: \"text/html\" }),\r\n                \"text/plain\": new Blob([textFallback], { type: \"text/plain\" }),\r\n            }),\r\n        ]);\r\n    } catch (err) {\r\n        console.log(\r\n            \"Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText\",\r\n            err\r\n        );\r\n        copySuccess = false;\r\n    }\r\n\r\n    if (!copySuccess) {\r\n        try {\r\n            await navigator.clipboard.writeText(textFallback);\r\n        } catch (err) {\r\n            console.log(\r\n                \"Permalink-to-clipboard using clipboard.writeText failed\",\r\n                err\r\n            );\r\n            console.error(\"Failed to copy link to clipboard!\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    console.log(`copied '${url}' to clipboard`);\r\n    const copiedMsg = document.createElement(\"p\");\r\n    copiedMsg.setAttribute(\"role\", \"alert\");\r\n    copiedMsg.className = \"permalink-alert\";\r\n    copiedMsg.innerHTML = \"Link to \" + msgLink + \" copied to clipboard\";\r\n    elem.parentElement.insertBefore(copiedMsg, elem);\r\n    await new Promise((resolve) => setTimeout(resolve, 1500));\r\n    copiedMsg.remove();\r\n}\r\n\r\nexport function initPermalinks() {\r\n    const permalinks = document.querySelectorAll(\".autopermalink > a\");\r\n    permalinks.forEach((link) => {\r\n        link.addEventListener(\"click\", function (event) {\r\n            event.preventDefault();\r\n            copyPermalink(link);\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Image magnification (click-to-zoom).\r\n *\r\n * Clicking an eligible image creates a full-width popup; clicking the\r\n * popup dismisses it.  Uses event delegation on the document body.\r\n */\r\n\r\n/**\r\n * Walk up from `el` through ancestors, collecting those that match `selector`.\r\n * Returns the *last* (outermost) match \u2014 equivalent to jQuery's\r\n * `.parents(selector).last()`.\r\n */\r\nfunction outermostMatchingAncestor(el, selector) {\r\n    let match = null;\r\n    let current = el.parentElement;\r\n    while (current) {\r\n        if (current.matches(selector)) {\r\n            match = current;\r\n        }\r\n        current = current.parentElement;\r\n    }\r\n    return match;\r\n}\r\n\r\nexport function initImageMagnify() {\r\n    const imgSelector =\r\n        \".image-box > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \".sbspanel > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > div > img:not(.draw_on_me):not(.mag_popup)\";\r\n\r\n    // Click an image to magnify\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const img = event.target.closest(imgSelector);\r\n        if (!img) return;\r\n\r\n        const container = document.createElement(\"div\");\r\n        container.setAttribute(\"style\", \"background:#fff;\");\r\n        container.setAttribute(\"class\", \"mag_popup_container\");\r\n        container.innerHTML =\r\n            '<img src=\"' +\r\n            img.src +\r\n            '\" style=\"width:100%\" class=\"mag_popup\"/>';\r\n\r\n        let placement = outermostMatchingAncestor(\r\n            img,\r\n            \".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)\"\r\n        );\r\n\r\n        // For .cols2, even articles go inside the previous odd one\r\n        if (placement && placement.tagName === \"ARTICLE\") {\r\n            const prev = placement.previousElementSibling;\r\n            if (prev) {\r\n                placement = prev.firstElementChild || prev;\r\n            }\r\n        }\r\n\r\n        if (placement) {\r\n            placement.parentNode.insertBefore(container, placement);\r\n        }\r\n    });\r\n\r\n    // Click the big image to dismiss it\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        if (event.target.classList.contains(\"mag_popup\")) {\r\n            event.target.parentNode.remove();\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Scrollbar width detection utility.\r\n *\r\n * \u26A0\uFE0F DEPRECATED: Only used by the GeoGebra calculator integration.\r\n * Consider replacing with a CSS-based approach in the future.\r\n *\r\n * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript\r\n */\r\n\r\nexport function getScrollbarWidth() {\r\n    const outer = document.createElement(\"div\");\r\n    outer.style.visibility = \"hidden\";\r\n    outer.style.width = \"100px\";\r\n    outer.style.msOverflowStyle = \"scrollbar\"; // needed for WinJS apps\r\n\r\n    document.body.appendChild(outer);\r\n\r\n    const widthNoScroll = outer.offsetWidth;\r\n    outer.style.overflow = \"scroll\";\r\n\r\n    const inner = document.createElement(\"div\");\r\n    inner.style.width = \"100%\";\r\n    outer.appendChild(inner);\r\n\r\n    const widthWithScroll = inner.offsetWidth;\r\n    outer.parentNode.removeChild(outer);\r\n\r\n    return widthNoScroll - widthWithScroll;\r\n}\r\n", "/**\r\n * GeoGebra calculator integration.\r\n *\r\n * Manages the floating GeoGebra calculator overlay: toggling visibility,\r\n * preventing body scroll while hovering the canvas, and injecting the\r\n * GeoGebra applet script on first open.\r\n */\r\n\r\nimport { getScrollbarWidth } from \"./deprecated/scrollbar-width.js\";\r\n\r\nfunction calculatorOnload() {\r\n    const toggle = document.getElementById(\"calculator-toggle\");\r\n    if (toggle) toggle.focus();\r\n    const inputField = document.querySelector(\r\n        \"input.gwt-SuggestBox.TextField\"\r\n    );\r\n    if (inputField) inputField.focus();\r\n}\r\n\r\nexport function initGeoGebra() {\r\n    const scrollWidth = getScrollbarWidth();\r\n    const calcOffsetR = 5;\r\n    const calcOffsetB = 5;\r\n\r\n    // Prevent body scroll when hovering the GeoGebra canvas\r\n    document.body.addEventListener(\"mouseover\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"hidden\";\r\n        document.documentElement.style.marginRight = \"15px\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + scrollWidth + \"px\";\r\n            container.style.bottom = calcOffsetB + scrollWidth + \"px\";\r\n        }\r\n    });\r\n\r\n    document.body.addEventListener(\"mouseout\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"scroll\";\r\n        document.documentElement.style.marginRight = \"0\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + \"px\";\r\n            container.style.bottom = calcOffsetB + \"px\";\r\n        }\r\n    });\r\n\r\n    // Toggle calculator visibility\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const toggle = event.target.closest(\"#calculator-toggle\");\r\n        if (!toggle) return;\r\n\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (!container) return;\r\n\r\n        if (container.style.display === \"none\" || !container.style.display) {\r\n            container.style.display = \"block\";\r\n            toggle.classList.add(\"open\");\r\n            toggle.setAttribute(\"title\", \"Hide calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"true\");\r\n\r\n            const existingScript = document.getElementById(\"create_ggb_calc\");\r\n            if (!existingScript) {\r\n                const ggbScript = document.createElement(\"script\");\r\n                ggbScript.id = \"create_ggb_calc\";\r\n                ggbScript.innerHTML = \"ggbApp.inject('geogebra-calculator')\";\r\n                document.body.appendChild(ggbScript);\r\n            } else {\r\n                calculatorOnload();\r\n            }\r\n        } else {\r\n            container.style.display = \"none\";\r\n            toggle.classList.remove(\"open\");\r\n            toggle.setAttribute(\"title\", \"Show calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"false\");\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Keyboard navigation handlers.\r\n *\r\n * - ENTER in a `.workspace` triggers MathJax typesetting.\r\n * - ESC navigates back through Sage cell focus, then up the knowl stack,\r\n *   or does nothing if no interactive context is active.\r\n * - Hash-based anchor navigation: opens knowls linked via URL hash.\r\n */\r\n\r\nlet justHitEscape = false;\r\n\r\nfunction processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n\r\nexport function initKeyboardNav() {\r\n    document.onkeyup = function (event) {\r\n        const e = event || window.event;\r\n        switch (e.keyCode) {\r\n            case 13: // ENTER\r\n                justHitEscape = false;\r\n                if (\r\n                    document.activeElement.classList.contains(\"workspace\")\r\n                ) {\r\n                    processWorkspace();\r\n                }\r\n                break; // Fixed: was missing, caused fallthrough to ESC handler\r\n\r\n            case 27: // ESC\r\n            {\r\n                const parentSageCell =\r\n                    document.activeElement.closest(\".sagecell_editor\");\r\n                if (parentSageCell && !justHitEscape) {\r\n                    justHitEscape = true;\r\n                    setTimeout(function () {\r\n                        justHitEscape = false;\r\n                    }, 1000);\r\n                }\r\n                // knowl_focus_stack is defined in knowl.js and may not exist\r\n                // in all contexts \u2014 guard against ReferenceError\r\n                else if (\r\n                    typeof knowl_focus_stack !== \"undefined\" &&\r\n                    knowl_focus_stack.length > 0\r\n                ) {\r\n                    const mostRecentlyOpened = knowl_focus_stack.pop();\r\n                    if (typeof knowl_focus_stack_uid !== \"undefined\") {\r\n                        knowl_focus_stack_uid.pop();\r\n                    }\r\n                    mostRecentlyOpened.focus();\r\n                } else {\r\n                    break;\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    };\r\n}\r\n\r\nexport function initAnchorKnowl() {\r\n    if (!window.location.hash.length) return;\r\n\r\n    const id = window.location.hash.substring(1);\r\n    const anchor = document.getElementById(id);\r\n    if (!anchor) return;\r\n\r\n    if (anchor.tagName === \"ARTICLE\") {\r\n        const containedKnowl = anchor.querySelector(\"a[data-knowl]\");\r\n        if (containedKnowl && containedKnowl.parentElement === anchor) {\r\n            containedKnowl.click();\r\n        }\r\n    } else if (anchor.hasAttribute(\"data-knowl\")) {\r\n        anchor.click();\r\n    } else {\r\n        // If it is a hidden knowl, find the knowl and open it\r\n        const hiddenContent = anchor.closest(\".hidden-content\");\r\n        if (hiddenContent) {\r\n            const refId = hiddenContent.id;\r\n            const knowl = document.querySelector(\r\n                '[data-refid=\"' + refId + '\"]'\r\n            );\r\n            if (knowl) knowl.click();\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview page geometry helpers.\r\n *\r\n * Utilities for converting CSS units to pixels, computing element heights,\r\n * and injecting dynamic @page / CSS-variable rules.\r\n */\r\n\r\nexport function toPixels(value) {\r\n    if (typeof value === \"number\") return value;\r\n    if (typeof value !== \"string\") return 0;\r\n    value = value.trim();\r\n    if (value.endsWith(\"px\")) {\r\n        return parseFloat(value);\r\n    } else if (value.endsWith(\"in\")) {\r\n        return Math.floor(parseFloat(value) * 96);\r\n    } else if (value.endsWith(\"cm\")) {\r\n        return Math.floor(parseFloat(value) * 37.8);\r\n    } else if (value.endsWith(\"mm\")) {\r\n        return Math.floor(parseFloat(value) * 3.78);\r\n    } else if (value.endsWith(\"pt\")) {\r\n        return Math.floor(parseFloat(value) * (96 / 72));\r\n    } else {\r\n        return parseFloat(value) || 0;\r\n    }\r\n}\r\n\r\nexport function getElementTotalHeight(elem) {\r\n    const style = getComputedStyle(elem);\r\n    const marginTop = parseFloat(style.marginTop);\r\n    const marginBottom = parseFloat(style.marginBottom);\r\n    const height = elem.offsetHeight;\r\n    return height + marginTop + marginBottom;\r\n}\r\n\r\nexport function getElemWorkspaceHeight(elem) {\r\n    if (elem.classList.contains(\"sidebyside\")) {\r\n        const sbspanels = elem.querySelectorAll(\".sbspanel\");\r\n        let max = 0;\r\n        sbspanels.forEach((panel) => {\r\n            const workspaces = panel.querySelectorAll(\".workspace\");\r\n            let totalHeight = 0;\r\n            workspaces.forEach((workspace) => {\r\n                const workspaceHeight = workspace.offsetHeight;\r\n                if (workspaceHeight) {\r\n                    totalHeight += workspaceHeight;\r\n                }\r\n            });\r\n            if (totalHeight > max) {\r\n                max = totalHeight;\r\n            }\r\n        });\r\n        return max;\r\n    }\r\n\r\n    let columns = 1;\r\n    if (elem.classList.contains(\"exercisegroup\")) {\r\n        for (let i = 2; i <= 6; i++) {\r\n            if (elem.querySelector(`.cols${i}`)) {\r\n                columns = i;\r\n                break;\r\n            }\r\n        }\r\n    }\r\n    const workspaces = elem.querySelectorAll(\".workspace\");\r\n    let totalHeight = 0;\r\n    workspaces.forEach((ws) => {\r\n        const workspaceHeight = ws.offsetHeight;\r\n        if (workspaceHeight) {\r\n            totalHeight += workspaceHeight;\r\n        }\r\n    });\r\n    return totalHeight / columns;\r\n}\r\n\r\nexport function setPageGeometryCSS({ paperSize, margins }) {\r\n    const existingStyle = document.getElementById(\"page-geometry-css\");\r\n    if (existingStyle) {\r\n        existingStyle.remove();\r\n    }\r\n    const wsWidth = paperSize === \"letter\" ? \"816px\" : \"794px\";\r\n    const wsHeight = paperSize === \"letter\" ? \"1056px\" : \"1123px\";\r\n\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"page-geometry-css\";\r\n    style.textContent = `\r\n        :root {\r\n            --ws-width: ${wsWidth};\r\n            --ws-height: ${wsHeight};\r\n            --ws-top-margin: ${margins.top}px;\r\n            --ws-right-margin: ${margins.right}px;\r\n            --ws-bottom-margin: ${margins.bottom}px;\r\n            --ws-left-margin: ${margins.left}px;\r\n        }\r\n        @page {\r\n            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);\r\n        }\r\n    `;\r\n    document.head.appendChild(style);\r\n}\r\n", "/**\r\n * Print-preview workspace height management.\r\n *\r\n * Handles setting initial workspace heights from data attributes,\r\n * adjusting heights to fit pages, highlighting workspace areas,\r\n * and MathJax re-typesetting on workspace edits.\r\n */\r\n\r\nimport { getElementTotalHeight, getElemWorkspaceHeight } from \"./geometry.js\";\r\n\r\nexport function setInitialWorkspaceHeights() {\r\n    const workspaces = document.querySelectorAll(\".workspace\");\r\n    workspaces.forEach((ws) => {\r\n        ws.style.height = ws.getAttribute(\"data-space\") || \"0px\";\r\n        ws.setAttribute(\"contenteditable\", \"true\");\r\n    });\r\n}\r\n\r\nexport function adjustWorkspaceToFitPage({ paperSize, margins }) {\r\n    // Toggle off workspace highlight if it is on\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(false);\r\n    }\r\n\r\n    let paperWidth, paperHeight;\r\n    if (paperSize === \"a4\" || document.body.classList.contains(\"a4\")) {\r\n        paperWidth = 794;\r\n        paperHeight = 1122.5;\r\n    } else {\r\n        paperWidth = 816;\r\n        paperHeight = 1056;\r\n    }\r\n    const paperContentHeight = paperHeight - (margins.top + margins.bottom);\r\n\r\n    setInitialWorkspaceHeights();\r\n\r\n    const pages = document.querySelectorAll(\".onepage\");\r\n    pages.forEach((page) => {\r\n        page.style.width = paperWidth + \"px\";\r\n        const rows = page.children;\r\n        let totalContentHeight = 0;\r\n        let totalWorkspaceHeight = 0;\r\n        for (const row of rows) {\r\n            totalContentHeight += getElementTotalHeight(row);\r\n            totalWorkspaceHeight += getElemWorkspaceHeight(row);\r\n        }\r\n        if (totalWorkspaceHeight === 0) {\r\n            page.style.width = \"\";\r\n            return;\r\n        }\r\n        const extraHeight = paperContentHeight - totalContentHeight;\r\n        const workspaceAdjustmentFactor =\r\n            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;\r\n        const pageWorkspaces = page.querySelectorAll(\".workspace\");\r\n        pageWorkspaces.forEach((ws) => {\r\n            const originalHeight = ws.offsetHeight;\r\n            const newHeight = originalHeight * workspaceAdjustmentFactor;\r\n            ws.style.height = newHeight + \"px\";\r\n        });\r\n        page.style.width = \"\";\r\n    });\r\n\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(true);\r\n    }\r\n}\r\n\r\nexport function toggleWorkspaceHighlight(isChecked) {\r\n    if (isChecked) {\r\n        document.body.classList.add(\"highlight-workspace\");\r\n        if (!document.querySelector(\".workspace-container\")) {\r\n            document.querySelectorAll(\".workspace\").forEach((workspace) => {\r\n                const container = document.createElement(\"div\");\r\n                container.classList.add(\"workspace-container\");\r\n                container.style.height =\r\n                    window.getComputedStyle(workspace).height;\r\n                const original = document.createElement(\"div\");\r\n                original.classList.add(\"original-workspace\");\r\n                const originalHeight =\r\n                    workspace.getAttribute(\"data-space\") || \"0px\";\r\n                original.setAttribute(\r\n                    \"title\",\r\n                    \"Author-specified workspace height (\" +\r\n                        originalHeight +\r\n                        \")\"\r\n                );\r\n                original.style.height = originalHeight;\r\n                container.appendChild(original);\r\n                if (original.offsetHeight > workspace.offsetHeight) {\r\n                    original.classList.add(\"warning\");\r\n                }\r\n                workspace.parentNode.insertBefore(container, workspace);\r\n                container.appendChild(workspace);\r\n            });\r\n        }\r\n    } else {\r\n        document.body.classList.remove(\"highlight-workspace\");\r\n        document\r\n            .querySelectorAll(\".workspace-container\")\r\n            .forEach((container) => {\r\n                const workspace = container.querySelector(\".workspace\");\r\n                container.parentNode.insertBefore(workspace, container);\r\n                container.remove();\r\n            });\r\n    }\r\n}\r\n\r\nexport function processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n", "/**\r\n * Dynamic-programming page-break algorithm.\r\n *\r\n * Given a list of content blocks with heights and workspace heights,\r\n * finds page-break positions that minimize leftover whitespace variance\r\n * across pages.\r\n */\r\n\r\nexport function findPageBreaks(rows, pageHeight) {\r\n    let pageBreaks = [];\r\n    let minCost = Array(rows.length + 1).fill(Infinity);\r\n    minCost[rows.length] = 0;\r\n    let nextPageBreak = Array(rows.length).fill(-1);\r\n\r\n    for (let i = rows.length - 1; i >= 0; i--) {\r\n        let cumulativeHeight = 0;\r\n        for (let j = i; j < rows.length; j++) {\r\n            cumulativeHeight += rows[j].height;\r\n            if (cumulativeHeight > pageHeight) {\r\n                if (j === i) {\r\n                    // Single row exceeds page height \u2014 give it its own page\r\n                    minCost[i] = 0;\r\n                    nextPageBreak[i] = i + 1;\r\n                }\r\n                break;\r\n            }\r\n\r\n            const cost =\r\n                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];\r\n            if (cost < minCost[i]) {\r\n                minCost[i] = cost;\r\n                nextPageBreak[i] = j + 1;\r\n            }\r\n        }\r\n    }\r\n\r\n    // Backtrack: row 0 is always a title sharing the first page with row 1\r\n    let nextPage = 1;\r\n    while (nextPage < rows.length) {\r\n        pageBreaks.push(nextPageBreak[nextPage]);\r\n        nextPage = nextPageBreak[nextPage];\r\n    }\r\n    return pageBreaks;\r\n}\r\n", "/**\r\n * Print-preview page creation and adjustment.\r\n *\r\n * Handles flattening paragraph sections, waiting for images,\r\n * adjusting pre-existing pages, and algorithmically creating\r\n * new page divisions for printout content.\r\n */\r\n\r\nimport {\r\n    getElementTotalHeight,\r\n    getElemWorkspaceHeight,\r\n} from \"./geometry.js\";\r\nimport { setInitialWorkspaceHeights } from \"./workspace.js\";\r\nimport { findPageBreaks } from \"./page-breaks.js\";\r\n\r\nexport function flattenParagraphsSections(printout) {\r\n    const paragraphsSections = printout.querySelectorAll(\r\n        \"section.paragraphs\"\r\n    );\r\n    paragraphsSections.forEach((section) => {\r\n        const parent = section.parentNode;\r\n        while (section.firstChild) {\r\n            parent.insertBefore(section.firstChild, section);\r\n        }\r\n        parent.removeChild(section);\r\n    });\r\n}\r\n\r\nexport function waitForImages(container, timeoutMs = 5000) {\r\n    const images = container.querySelectorAll(\"img\");\r\n    const promises = [];\r\n    for (const img of images) {\r\n        if (!img.complete) {\r\n            promises.push(\r\n                new Promise((resolve) => {\r\n                    img.addEventListener(\"load\", resolve, { once: true });\r\n                    img.addEventListener(\"error\", resolve, { once: true });\r\n                })\r\n            );\r\n        }\r\n    }\r\n    if (promises.length === 0) return Promise.resolve();\r\n    return Promise.race([\r\n        Promise.all(promises),\r\n        new Promise((resolve) => setTimeout(resolve, timeoutMs)),\r\n    ]);\r\n}\r\n\r\nexport function adjustPrintoutPages() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    if (pages.length === 0) return;\r\n\r\n    const firstPage = pages[0];\r\n    const lastPage = pages[pages.length - 1];\r\n\r\n    // Move all children before the first page into the first page\r\n    const pageFirstChild = firstPage.firstChild;\r\n    let currentChild = printout.firstChild;\r\n    while (currentChild && currentChild !== firstPage) {\r\n        const nextChild = currentChild.nextSibling;\r\n        firstPage.insertBefore(currentChild, pageFirstChild);\r\n        currentChild = nextChild;\r\n    }\r\n\r\n    // Move all children after the last page into the last page\r\n    let nextChild = lastPage.nextSibling;\r\n    while (nextChild) {\r\n        const tempChild = nextChild;\r\n        nextChild = nextChild.nextSibling;\r\n        lastPage.appendChild(tempChild);\r\n    }\r\n}\r\n\r\nexport function createPrintoutPages(margins) {\r\n    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);\r\n    const conservativeContentWidth = 794 - (margins.left + margins.right);\r\n\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    printout.style.width =\r\n        (conservativeContentWidth + margins.left + margins.right).toString() +\r\n        \"px\";\r\n    setInitialWorkspaceHeights(printout);\r\n\r\n    // Build list of blocks, handling sidebyside and tasks\r\n    let rows = [];\r\n    for (const child of printout.children) {\r\n        if (child.classList.contains(\"sidebyside\")) {\r\n            rows.push(child);\r\n        } else if (child.querySelector(\".task\")) {\r\n            rows.push(child);\r\n            const tasks = child.querySelectorAll(\".task, .conclusion\");\r\n\r\n            for (let i = 0; i < tasks.length; i++) {\r\n                let parent = tasks[i].parentElement;\r\n                let grandparent = parent.parentElement;\r\n                if (grandparent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subsubtask\");\r\n                } else if (parent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subtask\");\r\n                }\r\n            }\r\n            for (let i = tasks.length - 1; i > 0; i--) {\r\n                printout.insertBefore(tasks[i], child.nextSibling);\r\n            }\r\n        } else {\r\n            rows.push(child);\r\n        }\r\n    }\r\n\r\n    // Build block list with height info\r\n    let blockList = [];\r\n    for (const row of rows) {\r\n        let blockHeight = getElementTotalHeight(row);\r\n        if (blockHeight === 0) continue;\r\n\r\n        let totalWorkspaceHeight = 0;\r\n        if (row.querySelector(\".workspace\")) {\r\n            totalWorkspaceHeight = getElemWorkspaceHeight(row);\r\n        }\r\n        blockList.push({\r\n            elem: row,\r\n            height: blockHeight,\r\n            workspaceHeight: totalWorkspaceHeight,\r\n        });\r\n    }\r\n\r\n    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);\r\n\r\n    // Create page divs\r\n    for (let i = 0; i < pageBreaks.length; i++) {\r\n        const pageDiv = document.createElement(\"section\");\r\n        pageDiv.classList.add(\"onepage\");\r\n        if (i === 0) pageDiv.classList.add(\"firstpage\");\r\n        if (i === pageBreaks.length - 1) pageDiv.classList.add(\"lastpage\");\r\n\r\n        const start = pageBreaks[i - 1] || 0;\r\n        const end = pageBreaks[i];\r\n        for (let j = start; j < end; j++) {\r\n            pageDiv.appendChild(blockList[j].elem);\r\n        }\r\n        printout.appendChild(pageDiv);\r\n    }\r\n\r\n    // Remove content not in a page\r\n    for (const child of Array.from(printout.children)) {\r\n        if (!child.classList.contains(\"onepage\")) {\r\n            printout.removeChild(child);\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview header and footer management.\r\n *\r\n * Adds editable header/footer divs to each page, populates them from\r\n * localStorage or data attributes, and persists edits back to localStorage.\r\n */\r\n\r\nexport function addHeadersAndFootersToPrintout() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    pages.forEach((page, index) => {\r\n        const isFirstPage = index === 0;\r\n\r\n        const headerDiv = document.createElement(\"div\");\r\n        headerDiv.classList.add(\r\n            isFirstPage ? \"first-page-header\" : \"running-header\",\r\n            \"hidden\"\r\n        );\r\n        headerDiv.innerHTML = `<div class=\"header-left\" contenteditable=\"true\"></div><div class=\"header-center\" contenteditable=\"true\"></div><div class=\"header-right\" contenteditable=\"true\"></div>`;\r\n        page.insertBefore(headerDiv, page.firstChild);\r\n\r\n        const footerDiv = document.createElement(\"div\");\r\n        footerDiv.classList.add(\r\n            isFirstPage ? \"first-page-footer\" : \"running-footer\",\r\n            \"hidden\"\r\n        );\r\n        footerDiv.innerHTML = `<div class=\"footer-left\" contenteditable=\"true\"></div><div class=\"footer-center\" contenteditable=\"true\"></div><div class=\"footer-right\" contenteditable=\"true\"></div>`;\r\n        page.appendChild(footerDiv);\r\n    });\r\n\r\n    // Populate from localStorage or data attributes\r\n    const keys = [\r\n        \"header-first-left\",\r\n        \"header-first-center\",\r\n        \"header-first-right\",\r\n        \"footer-first-left\",\r\n        \"footer-first-center\",\r\n        \"footer-first-right\",\r\n        \"header-running-left\",\r\n        \"header-running-center\",\r\n        \"header-running-right\",\r\n        \"footer-running-left\",\r\n        \"footer-running-center\",\r\n        \"footer-running-right\",\r\n    ];\r\n\r\n    const content = {};\r\n    keys.forEach((key) => {\r\n        content[key] =\r\n            localStorage.getItem(key) ||\r\n            printout.getAttribute(`data-${key}`) ||\r\n            \"\";\r\n    });\r\n\r\n    // First page\r\n    const firstHeader = document.querySelector(\".first-page-header\");\r\n    if (firstHeader) {\r\n        firstHeader.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-first-left\"];\r\n        firstHeader.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-first-center\"];\r\n        firstHeader.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-first-right\"];\r\n    }\r\n    const firstFooter = document.querySelector(\".first-page-footer\");\r\n    if (firstFooter) {\r\n        firstFooter.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-first-left\"];\r\n        firstFooter.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-first-center\"];\r\n        firstFooter.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-first-right\"];\r\n    }\r\n\r\n    // Running headers and footers\r\n    document.querySelectorAll(\".running-header\").forEach((headerDiv) => {\r\n        headerDiv.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-running-left\"];\r\n        headerDiv.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-running-center\"];\r\n        headerDiv.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-running-right\"];\r\n    });\r\n    document.querySelectorAll(\".running-footer\").forEach((footerDiv) => {\r\n        footerDiv.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-running-left\"];\r\n        footerDiv.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-running-center\"];\r\n        footerDiv.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-running-right\"];\r\n    });\r\n\r\n    // Persist edits to localStorage\r\n    const selectorMap = {\r\n        \"header-first-left\": \".first-page-header .header-left\",\r\n        \"header-first-center\": \".first-page-header .header-center\",\r\n        \"header-first-right\": \".first-page-header .header-right\",\r\n        \"footer-first-left\": \".first-page-footer .footer-left\",\r\n        \"footer-first-center\": \".first-page-footer .footer-center\",\r\n        \"footer-first-right\": \".first-page-footer .footer-right\",\r\n        \"header-running-left\": \".running-header .header-left\",\r\n        \"header-running-center\": \".running-header .header-center\",\r\n        \"header-running-right\": \".running-header .header-right\",\r\n        \"footer-running-left\": \".running-footer .footer-left\",\r\n        \"footer-running-center\": \".running-footer .footer-center\",\r\n        \"footer-running-right\": \".running-footer .footer-right\",\r\n    };\r\n    keys.forEach((key) => {\r\n        const elements = document.querySelectorAll(selectorMap[key]);\r\n        elements.forEach((elem) => {\r\n            elem.addEventListener(\"input\", () => {\r\n                localStorage.setItem(key, elem.innerHTML);\r\n            });\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Paper size detection.\r\n *\r\n * Determines paper size (letter vs a4) from localStorage, or falls back\r\n * to geographic detection via ipapi.co.\r\n */\r\n\r\nexport function getPaperSize() {\r\n    let paperSize = localStorage.getItem(\"papersize\");\r\n    if (paperSize) return paperSize;\r\n\r\n    // Try to set papersize based on user's geographic region\r\n    try {\r\n        fetch(\"https://ipapi.co/json/\")\r\n            .then((response) => response.json())\r\n            .then((data) => {\r\n                const continent =\r\n                    data && data.continent_code ? data.continent_code : \"\";\r\n                paperSize =\r\n                    continent === \"NA\" || continent === \"SA\"\r\n                        ? \"letter\"\r\n                        : \"a4\";\r\n                const radio = document.querySelector(\r\n                    `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n                );\r\n                if (radio) {\r\n                    radio.checked = true;\r\n                    localStorage.setItem(\"papersize\", paperSize);\r\n                }\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(paperSize);\r\n            })\r\n            .catch((err) => {\r\n                throw err;\r\n            });\r\n    } catch (e) {\r\n        const radio = document.querySelector(\r\n            'input[name=\"papersize\"][value=\"letter\"]'\r\n        );\r\n        if (radio) radio.checked = true;\r\n    }\r\n    return paperSize || \"letter\";\r\n}\r\n", "/**\r\n * Printout section loading (print preview).\r\n *\r\n * Swaps the current page content with the target printable section\r\n * and switches to the print-worksheet stylesheet.\r\n */\r\n\r\nexport async function loadPrintout(printableSectionID) {\r\n    const themeStylesheetLink = document.querySelector(\r\n        'link[rel=\"stylesheet\"][href*=\"theme\"]'\r\n    );\r\n    const themeStylesheetHref = themeStylesheetLink\r\n        ? themeStylesheetLink.getAttribute(\"href\")\r\n        : null;\r\n\r\n    if (themeStylesheetHref) {\r\n        const printStylesheetHref = themeStylesheetHref.replace(\r\n            /theme.*\\.css/,\r\n            \"print-worksheet.css\"\r\n        );\r\n        themeStylesheetLink.setAttribute(\"href\", printStylesheetHref);\r\n        await new Promise((resolve) => {\r\n            themeStylesheetLink.addEventListener(\"load\", resolve, {\r\n                once: true,\r\n            });\r\n        });\r\n    }\r\n\r\n    const printableSection = document.getElementById(printableSectionID);\r\n    if (!printableSection) {\r\n        console.error(\"No section found with ID:\", printableSectionID);\r\n        return;\r\n    }\r\n\r\n    const ptxContent = document.querySelector(\".ptx-content\");\r\n    const existingSections = ptxContent.querySelectorAll(\":scope > section\");\r\n    existingSections.forEach((sec) => ptxContent.removeChild(sec));\r\n    ptxContent.appendChild(printableSection);\r\n}\r\n", "/**\r\n * Solution rewriting for print preview.\r\n *\r\n * Converts <details>/<summary> solution elements into plain <div>s\r\n * with a heading, so they render properly in print layout.\r\n */\r\n\r\nexport function rewriteSolutions() {\r\n    const bornHiddenKnowls = document.querySelectorAll(\r\n        \".worksheet details, .handout details\"\r\n    );\r\n    bornHiddenKnowls.forEach(function (detail) {\r\n        const summary = detail.querySelector(\"summary\");\r\n        const content = detail.innerHTML.replace(summary.outerHTML, \"\");\r\n        const div = document.createElement(\"div\");\r\n        div.classList = detail.classList;\r\n        if (summary) {\r\n            const title = document.createElement(\"h5\");\r\n            title.innerHTML = summary.innerHTML;\r\n            div.appendChild(title);\r\n        }\r\n        const body = document.createElement(\"div\");\r\n        body.innerHTML = content;\r\n        div.appendChild(body);\r\n        detail.parentNode.replaceChild(div, detail);\r\n    });\r\n}\r\n", "/**\r\n * Print-preview initialization and controls.\r\n *\r\n * Orchestrates the print-preview workflow: loading the printout section,\r\n * setting up paper size controls, managing solution visibility, creating\r\n * or adjusting pages, and wiring up header/footer toggles.\r\n */\r\n\r\nimport { toPixels, setPageGeometryCSS } from \"./geometry.js\";\r\nimport {\r\n    adjustWorkspaceToFitPage,\r\n    toggleWorkspaceHighlight,\r\n} from \"./workspace.js\";\r\nimport {\r\n    flattenParagraphsSections,\r\n    waitForImages,\r\n    adjustPrintoutPages,\r\n    createPrintoutPages,\r\n} from \"./pages.js\";\r\nimport { addHeadersAndFootersToPrintout } from \"./headers-footers.js\";\r\nimport { getPaperSize } from \"./paper-size.js\";\r\nimport { loadPrintout } from \"./section-swap.js\";\r\nimport { rewriteSolutions } from \"./solutions.js\";\r\n\r\nexport async function initPrintPreview() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"printpreview\")) return;\r\n\r\n    const printableSectionID = urlParams.get(\"printpreview\");\r\n    await loadPrintout(printableSectionID);\r\n\r\n    // Parse margins\r\n    const marginList = document\r\n        .querySelector(\"section.worksheet, section.handout\")\r\n        .getAttribute(\"data-margins\")\r\n        .split(\" \");\r\n    const margins = {\r\n        top: toPixels(marginList[0] || \"0.75in\"),\r\n        right: toPixels(marginList[1] || \"0.75in\"),\r\n        bottom: toPixels(marginList[2] || \"0.75in\"),\r\n        left: toPixels(marginList[3] || \"0.75in\"),\r\n    };\r\n\r\n    rewriteSolutions();\r\n\r\n    // Paper size setup\r\n    let paperSize = getPaperSize();\r\n    if (paperSize) {\r\n        const radio = document.querySelector(\r\n            `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n        );\r\n        if (radio) radio.checked = true;\r\n        document.body.classList.remove(\"a4\", \"letter\");\r\n        document.body.classList.add(paperSize);\r\n        setPageGeometryCSS({ paperSize, margins });\r\n    }\r\n\r\n    // Paper size radio change handlers\r\n    const papersizeRadios = document.querySelectorAll(\r\n        'input[name=\"papersize\"]'\r\n    );\r\n    papersizeRadios.forEach((radio) => {\r\n        radio.addEventListener(\"change\", function () {\r\n            if (this.checked) {\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(this.value);\r\n                localStorage.setItem(\"papersize\", this.value);\r\n                setPageGeometryCSS({ paperSize: this.value, margins });\r\n                adjustWorkspaceToFitPage({\r\n                    paperSize: this.value,\r\n                    margins,\r\n                });\r\n            }\r\n        });\r\n    });\r\n\r\n    // Solution visibility checkboxes\r\n    for (const solutionType of [\"hint\", \"answer\", \"solution\"]) {\r\n        const checkbox = document.getElementById(\r\n            `hide-${solutionType}-checkbox`\r\n        );\r\n        if (!checkbox) continue;\r\n\r\n        const storageKey = `hide-${solutionType}`;\r\n        if (\r\n            (solutionType === \"answer\" || solutionType === \"solution\") &&\r\n            !localStorage.getItem(storageKey)\r\n        ) {\r\n            checkbox.checked = true;\r\n            localStorage.setItem(storageKey, \"true\");\r\n        }\r\n\r\n        checkbox.checked = localStorage.getItem(storageKey) === \"true\";\r\n        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.add(\"hidden\");\r\n            } else {\r\n                elem.classList.remove(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(storageKey, this.checked);\r\n            document\r\n                .querySelectorAll(`div.${solutionType}`)\r\n                .forEach((elem) => {\r\n                    if (checkbox.checked) {\r\n                        elem.classList.add(\"hidden\");\r\n                    } else {\r\n                        elem.classList.remove(\"hidden\");\r\n                    }\r\n                    adjustWorkspaceToFitPage({ paperSize, margins });\r\n                });\r\n        });\r\n    }\r\n\r\n    // Build pages\r\n    const printoutSection = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (printoutSection) {\r\n        flattenParagraphsSections(printoutSection);\r\n        await waitForImages(printoutSection);\r\n    }\r\n\r\n    if (document.querySelector(\".onepage\")) {\r\n        adjustPrintoutPages();\r\n    } else {\r\n        createPrintoutPages(margins);\r\n    }\r\n\r\n    addHeadersAndFootersToPrintout();\r\n\r\n    // Header/footer toggle checkboxes\r\n    for (const hf of [\r\n        \"first-page-header\",\r\n        \"running-header\",\r\n        \"first-page-footer\",\r\n        \"running-footer\",\r\n    ]) {\r\n        const checkbox = document.getElementById(`print-${hf}-checkbox`);\r\n        if (!checkbox) continue;\r\n\r\n        checkbox.checked =\r\n            localStorage.getItem(`print-${hf}`) === \"true\";\r\n        document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.remove(\"hidden\");\r\n            } else {\r\n                elem.classList.add(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(`print-${hf}`, this.checked);\r\n            document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n                if (checkbox.checked) {\r\n                    elem.classList.remove(\"hidden\");\r\n                } else {\r\n                    elem.classList.add(\"hidden\");\r\n                }\r\n                adjustWorkspaceToFitPage({ paperSize, margins });\r\n            });\r\n        });\r\n    }\r\n\r\n    // Adjust workspace heights\r\n    adjustWorkspaceToFitPage({ paperSize, margins });\r\n\r\n    // Highlight workspace checkbox\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    if (highlightCheckbox) {\r\n        highlightCheckbox.checked =\r\n            localStorage.getItem(\"highlightWorkspace\") === \"true\";\r\n        highlightCheckbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(\"highlightWorkspace\", this.checked);\r\n            toggleWorkspaceHighlight(this.checked);\r\n        });\r\n        toggleWorkspaceHighlight(highlightCheckbox.checked);\r\n    }\r\n}\r\n", "/**\r\n * Dark/light mode switching.\r\n *\r\n * Detects user preference via localStorage or `prefers-color-scheme`,\r\n * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.\r\n */\r\n\r\nexport function isDarkMode() {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return false;\r\n\r\n    const currentTheme = localStorage.getItem(\"theme\");\r\n    if (currentTheme === \"dark\") return true;\r\n    if (currentTheme === \"light\") return false;\r\n\r\n    return (\r\n        window.matchMedia &&\r\n        window.matchMedia(\"(prefers-color-scheme: dark)\").matches\r\n    );\r\n}\r\n\r\nexport function setDarkMode(isDark) {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return;\r\n\r\n    const parentHtml = document.documentElement;\r\n    const iframes = document.querySelectorAll(\r\n        \"iframe[data-dark-mode-enabled]\"\r\n    );\r\n\r\n    if (isDark) {\r\n        parentHtml.classList.add(\"dark-mode\");\r\n    } else {\r\n        parentHtml.classList.remove(\"dark-mode\");\r\n    }\r\n\r\n    // Sync each iframe's <html> class with the parent\r\n    for (const iframe of iframes) {\r\n        try {\r\n            const iframeHtml = iframe.contentWindow.document.documentElement;\r\n            if (isDark) {\r\n                iframeHtml.classList.add(\"dark-mode\");\r\n            } else {\r\n                iframeHtml.classList.remove(\"dark-mode\");\r\n            }\r\n        } catch (err) {\r\n            console.warn(\"Dark mode sync to iframe failed:\", err);\r\n        }\r\n    }\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.querySelector(\".icon\").innerText = isDark\r\n            ? \"light_mode\"\r\n            : \"dark_mode\";\r\n        modeButton.querySelector(\".name\").innerText = isDark\r\n            ? \"Light Mode\"\r\n            : \"Dark Mode\";\r\n    }\r\n}\r\n\r\nexport function initThemeToggle() {\r\n    // Run immediately to avoid flicker\r\n    setDarkMode(isDarkMode());\r\n\r\n    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)\r\n    const isDark = isDarkMode();\r\n    setDarkMode(isDark);\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.addEventListener(\"click\", function () {\r\n            const wasDark = isDarkMode();\r\n            setDarkMode(!wasDark);\r\n            localStorage.setItem(\"theme\", wasDark ? \"light\" : \"dark\");\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * Embed/share button and embed-mode display.\r\n *\r\n * Provides the \"embed in LMS\" button that copies an <iframe> snippet,\r\n * and strips chrome when the page is loaded in embed mode (?embed).\r\n */\r\n\r\nimport { setDarkMode } from \"./theme.js\";\r\n\r\nexport function initShareButton() {\r\n    const shareButton = document.getElementById(\"embed-button\");\r\n    if (!shareButton) return;\r\n\r\n    const sharePopup = document.getElementById(\"embed-popup\");\r\n    const embedCode =\r\n        \"<iframe src='\" +\r\n        window.location.href +\r\n        \"?embed' width='100%' height='1000px' frameborder='0'></iframe>\";\r\n    const embedTextbox = document.getElementById(\"embed-code-textbox\");\r\n    if (embedTextbox) {\r\n        embedTextbox.value = embedCode;\r\n    }\r\n\r\n    shareButton.addEventListener(\"click\", function () {\r\n        sharePopup.classList.toggle(\"hidden\");\r\n    });\r\n\r\n    const copyButton = document.getElementById(\"copy-embed-button\");\r\n    if (copyButton) {\r\n        copyButton.addEventListener(\"click\", function () {\r\n            const textbox = document.getElementById(\"embed-code-textbox\");\r\n            if (textbox) {\r\n                navigator.clipboard\r\n                    .writeText(embedCode)\r\n                    .then(() => {\r\n                        console.log(\"Embed code copied to clipboard!\");\r\n                    })\r\n                    .catch((err) => {\r\n                        console.error(\"Failed to copy embed code: \", err);\r\n                    });\r\n                copyButton.querySelector(\".icon\").innerText =\r\n                    \"library_add_check\";\r\n                setTimeout(function () {\r\n                    copyButton.querySelector(\".icon\").innerText =\r\n                        \"content_copy\";\r\n                    sharePopup.classList.add(\"hidden\");\r\n                }, 450);\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initEmbedMode() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"embed\")) return;\r\n\r\n    // Set dark mode based on value of param\r\n    if (urlParams.get(\"embed\") === \"dark\") {\r\n        setDarkMode(true);\r\n    } else {\r\n        setDarkMode(false);\r\n    }\r\n\r\n    const elemsToHide = [\r\n        \"ptx-navbar\",\r\n        \"ptx-masthead\",\r\n        \"ptx-page-footer\",\r\n        \"ptx-sidebar\",\r\n        \"ptx-content-footer\",\r\n    ];\r\n    for (const id of elemsToHide) {\r\n        const elem = document.getElementById(id);\r\n        if (elem) {\r\n            elem.classList.add(\"hidden\");\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Code block copy-to-clipboard button.\r\n *\r\n * Wraps `.clipboardable` elements with a container and injects a copy\r\n * button.  Clicking the button copies the `<pre>` content.\r\n */\r\n\r\nexport function initCodeCopyButtons() {\r\n    const elements = document.querySelectorAll(\".clipboardable\");\r\n    for (const el of elements) {\r\n        const div = document.createElement(\"div\");\r\n        div.classList.add(\"clipboardable\");\r\n        el.classList.remove(\"clipboardable\");\r\n        el.replaceWith(div);\r\n        div.insertAdjacentElement(\"afterbegin\", el);\r\n        div.insertAdjacentHTML(\r\n            \"beforeend\",\r\n            `\r\n    <button class=\"code-copy\" title=\"Copy code\" role=\"button\" aria-label=\"Copy code\" >\r\n        <span class=\"copyicon material-symbols-outlined\">content_copy</span>\r\n        <span class=\"checkmark material-symbols-outlined\">check</span>\r\n    </button>\r\n            `.trim()\r\n        );\r\n    }\r\n}\r\n\r\nexport function initCodeCopyHandler() {\r\n    document.addEventListener(\"click\", (ev) => {\r\n        const codeBox = ev.target.closest(\".clipboardable\");\r\n        if (!navigator.clipboard || !codeBox) return;\r\n        const button = ev.target.closest(\".code-copy\");\r\n        if (!button) return;\r\n        const preContent = codeBox.querySelector(\"pre\").textContent;\r\n        navigator.clipboard.writeText(preContent);\r\n        button.classList.toggle(\"copied\");\r\n        setTimeout(() => button.classList.toggle(\"copied\"), 1000);\r\n    });\r\n}\r\n", "/**\r\n * Auto-ID generation for paragraphs without IDs.\r\n *\r\n * \u26A0\uFE0F DEPRECATED / SUSPICIOUS: Generates IDs like \"base-id-part2\", \"base-id-part3\"\r\n * for <p> elements that lack an id, based on the nearest preceding <p> that has one.\r\n * Produces heavy console.log output. It is unclear whether any downstream code\r\n * depends on the generated IDs.\r\n */\r\n\r\nexport function initAutoId() {\r\n    const noIdParagraphs = document.querySelectorAll(\".main p:not([id])\");\r\n    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {\r\n        const e = noIdParagraphs[n];\r\n        if (e.hasAttribute(\"id\")) continue;\r\n        if (e.classList.contains(\"watermark\")) continue;\r\n\r\n        // Find all preceding sibling <p> elements\r\n        const prevParagraphs = [];\r\n        let sibling = e.previousElementSibling;\r\n        while (sibling) {\r\n            if (sibling.tagName === \"P\") {\r\n                prevParagraphs.push(sibling);\r\n            }\r\n            sibling = sibling.previousElementSibling;\r\n        }\r\n\r\n        if (prevParagraphs.length === 0) continue;\r\n\r\n        let partsFound = 1;\r\n        const partsToId = [e];\r\n        for (let i = 0; i < prevParagraphs.length; ++i) {\r\n            const thisPrevious = prevParagraphs[i];\r\n            if (!thisPrevious.hasAttribute(\"id\")) {\r\n                partsToId.unshift(thisPrevious);\r\n            } else {\r\n                const baseId = thisPrevious.id;\r\n                for (let j = 0; j < partsToId.length; ++j) {\r\n                    ++partsFound;\r\n                    const nextId = baseId + \"-part\" + partsFound.toString();\r\n                    partsToId[j].setAttribute(\"id\", nextId);\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Video magnification (resize YouTube iframes to full browser width).\r\n *\r\n * \u26A0\uFE0F DEAD CODE: The selector `body iframeXXXX` intentionally matches no\r\n * elements.  This module is preserved for reference but has no effect.\r\n */\r\n\r\nexport function initVideoMagnify() {\r\n    const allIframes = document.querySelectorAll(\"body iframeXXXX\");\r\n    for (let i = 0; i < allIframes.length; i++) {\r\n        const thisItem = allIframes[i];\r\n        const thisItemSrc = thisItem.src;\r\n        if (!thisItemSrc.includes(\"youtube\")) continue;\r\n\r\n        const thisItemId = thisItem.id;\r\n        const thisItemWidth = thisItem.width;\r\n        const thisItemHeight = thisItem.height;\r\n        if (thisItemHeight < 150) continue;\r\n\r\n        const emptyDiv = document.createElement(\"div\");\r\n        const videomagContainer = document.createElement(\"div\");\r\n        const parentTag = thisItem.parentElement.tagName;\r\n        if (parentTag === \"FIGURE\") {\r\n            videomagContainer.setAttribute(\"class\", \"videobig\");\r\n        } else {\r\n            videomagContainer.setAttribute(\"class\", \"videobig nofigure\");\r\n        }\r\n        videomagContainer.setAttribute(\"video-id\", thisItemId);\r\n        videomagContainer.setAttribute(\"data-width\", thisItemWidth);\r\n        videomagContainer.setAttribute(\"data-height\", thisItemHeight);\r\n        videomagContainer.innerHTML = \"fit width\";\r\n\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", videomagContainer);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n    }\r\n\r\n    // Toggle handlers\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const bigBtn = event.target.closest(\".videobig\");\r\n        if (bigBtn) {\r\n            const videoId = bigBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = parseInt(bigBtn.getAttribute(\"data-width\"));\r\n            const originalHeight = parseInt(bigBtn.getAttribute(\"data-height\"));\r\n            const browserWidth = window.innerWidth;\r\n            const widthRatio = browserWidth / originalWidth;\r\n\r\n            video.setAttribute(\"width\", widthRatio * originalWidth);\r\n            video.setAttribute(\"height\", widthRatio * originalHeight);\r\n            video.setAttribute(\r\n                \"style\",\r\n                \"position:relative; left:-260px; z-index:1000\"\r\n            );\r\n            bigBtn.setAttribute(\"class\", \"videosmall\");\r\n            bigBtn.innerHTML = \"make small\";\r\n            return;\r\n        }\r\n\r\n        const smallBtn = event.target.closest(\".videosmall\");\r\n        if (smallBtn) {\r\n            const videoId = smallBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = smallBtn.getAttribute(\"data-width\");\r\n            const originalHeight = smallBtn.getAttribute(\"data-height\");\r\n\r\n            video.removeAttribute(\"style\");\r\n            video.setAttribute(\"width\", originalWidth);\r\n            video.setAttribute(\"height\", originalHeight);\r\n            smallBtn.setAttribute(\"class\", \"videobig\");\r\n            smallBtn.innerHTML = \"fit width\";\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * PreTeXt Core \u2014 main entry point.\r\n *\r\n * Bundles all core PreTeXt JavaScript into a single IIFE script.\r\n * This replaces the old pattern of loading jquery.min.js + pretext.js +\r\n * pretext_add_on.js + knowl.js + lti_iframe_resizer.js as separate scripts.\r\n */\r\n\r\n// --- Core modules (from pretext.js, knowl.js, lti_iframe_resizer.js) ---\r\nimport { initToc, initFocusedToc, initScrollToc } from \"./toc.js\";\r\nimport { initKnowls } from \"./knowl.js\";\r\nimport { initLtiIframeResizer } from \"./lti-iframe-resizer.js\";\r\n\r\n// --- Modules extracted from pretext_add_on.js ---\r\nimport { initPermalinks } from \"./permalink.js\";\r\nimport { initImageMagnify } from \"./image-magnify.js\";\r\nimport { initGeoGebra } from \"./geogebra.js\";\r\nimport { initKeyboardNav, initAnchorKnowl } from \"./keyboard-nav.js\";\r\nimport { initPrintPreview } from \"./print-preview/index.js\";\r\nimport { isDarkMode, setDarkMode, initThemeToggle } from \"./theme.js\";\r\nimport { initShareButton, initEmbedMode } from \"./embed.js\";\r\nimport { initCodeCopyButtons, initCodeCopyHandler } from \"./code-copy.js\";\r\n\r\n// --- Deprecated modules (included but flagged for future removal) ---\r\nimport { initAutoId } from \"./deprecated/auto-id.js\";\r\nimport { initVideoMagnify } from \"./deprecated/video-magnify.js\";\r\n\r\n// Run dark mode immediately to avoid flash of wrong theme\r\nsetDarkMode(isDarkMode());\r\n\r\n// Expose theme functions globally for inline scripts (e.g., mermaid init in XSL)\r\nwindow.isDarkMode = isDarkMode;\r\nwindow.setDarkMode = setDarkMode;\r\n\r\n// --- DOMContentLoaded handlers ---\r\nwindow.addEventListener(\"DOMContentLoaded\", function () {\r\n    // TOC and sidebar\r\n    initToc();\r\n    initFocusedToc();\r\n    initScrollToc();\r\n\r\n    // Permalinks\r\n    initPermalinks();\r\n\r\n    // Theme toggle button\r\n    initThemeToggle();\r\n\r\n    // Embed/share button and embed mode\r\n    initShareButton();\r\n    initEmbedMode();\r\n\r\n    // Code copy buttons\r\n    initCodeCopyButtons();\r\n\r\n    // Print preview (conditionally activates based on URL params)\r\n    initPrintPreview();\r\n});\r\n\r\n// --- Load handlers (need full page including images/styles) ---\r\nwindow.addEventListener(\"load\", function () {\r\n    // Knowls\r\n    initKnowls();\r\n\r\n    // LTI iframe resizer\r\n    initLtiIframeResizer();\r\n\r\n    // Image magnification\r\n    initImageMagnify();\r\n\r\n    // GeoGebra calculator\r\n    initGeoGebra();\r\n\r\n    // Keyboard navigation (ESC/ENTER)\r\n    initKeyboardNav();\r\n\r\n    // Anchor-based knowl opening\r\n    initAnchorKnowl();\r\n\r\n    // Deprecated: auto-ID generation\r\n    initAutoId();\r\n\r\n    // Deprecated: video magnification (dead code \u2014 selector matches nothing)\r\n    initVideoMagnify();\r\n});\r\n\r\n// Code copy click handler (uses event delegation, safe to register early)\r\ninitCodeCopyHandler();\r\n"],
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+  "sourcesContent": ["/**\r\n * TOC, sidebar, and navigation (from pretext.js).\r\n *\r\n * Manages the table-of-contents sidebar: scroll-to-active, toggle\r\n * visibility, auto-collapse, focused/expandable TOC items, and\r\n * hash-based navigation.\r\n */\r\n\r\nfunction getOffsetTop(e) {\r\n    if (!e) return 0;\r\n    return getOffsetTop(e.offsetParent) + e.offsetTop;\r\n}\r\n\r\nfunction scrollTocToActive() {\r\n    let fileNameWHash = window.location.href.split(\"/\").pop();\r\n    let fileName = fileNameWHash.split(\"#\")[0];\r\n\r\n    let tocEntry = document.querySelector(\r\n        '#ptx-toc a[href=\"' + fileName + '\"]'\r\n    );\r\n    if (!tocEntry) return;\r\n\r\n    let tocEntryTop = 0;\r\n    if (fileNameWHash.includes(\"#\")) {\r\n        let tocEntryWHash = document.querySelector(\r\n            '#ptx-toc a[href=\"' + fileNameWHash + '\"]'\r\n        );\r\n        if (tocEntryWHash) {\r\n            tocEntry\r\n                .closest(\"li\")\r\n                .querySelectorAll(\"li\")\r\n                .forEach((li) => {\r\n                    li.classList.remove(\"active\");\r\n                });\r\n            tocEntryWHash.closest(\"li\").classList.add(\"active\");\r\n            tocEntryTop = getOffsetTop(tocEntryWHash);\r\n        }\r\n    }\r\n    if (!tocEntryTop) {\r\n        tocEntryTop = getOffsetTop(tocEntry);\r\n    }\r\n\r\n    tocEntry.closest(\"li\").classList.add(\"active\");\r\n    let toc = document.querySelector(\"#ptx-toc\");\r\n    let tocTop = getOffsetTop(toc);\r\n    toc.scrollTop = tocEntryTop - tocTop - 0.4 * self.innerHeight;\r\n}\r\n\r\nfunction toggletoc() {\r\n    const thesidebar = document.getElementById(\"ptx-sidebar\");\r\n    if (\r\n        thesidebar.classList.contains(\"hidden\") ||\r\n        thesidebar.classList.contains(\"visible\")\r\n    ) {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else if (thesidebar.offsetParent === null) {\r\n        thesidebar.classList.toggle(\"visible\");\r\n    } else {\r\n        thesidebar.classList.toggle(\"hidden\");\r\n    }\r\n    scrollTocToActive();\r\n}\r\n\r\nfunction samePageLink(a) {\r\n    if (!(a instanceof HTMLAnchorElement)) return false;\r\n    try {\r\n        const linkUrl = new URL(a.href, document.baseURI);\r\n        const currentUrl = new URL(window.location.href);\r\n        const sameDocument =\r\n            linkUrl.origin === currentUrl.origin &&\r\n            linkUrl.pathname === currentUrl.pathname &&\r\n            linkUrl.search === currentUrl.search;\r\n        return sameDocument && !!linkUrl.hash;\r\n    } catch (e) {\r\n        return false;\r\n    }\r\n}\r\n\r\nfunction getTOCItemType(item) {\r\n    for (let className of item.classList) {\r\n        if (\r\n            className !== \"toc-item\" &&\r\n            className.length > 3 &&\r\n            className.slice(0, 4) === \"toc-\"\r\n        )\r\n            return className.slice(4);\r\n    }\r\n    return \"\";\r\n}\r\n\r\nfunction getTOCItemDepth(item) {\r\n    let depth = 0;\r\n    let curParent = item.closest(\".toc-item-list\");\r\n    while (curParent !== null) {\r\n        depth++;\r\n        curParent = curParent.parentElement.closest(\".toc-item-list\");\r\n    }\r\n    return depth;\r\n}\r\n\r\nfunction toggleTOCItem(expander) {\r\n    let listItem = expander.closest(\".toc-item\");\r\n    listItem.classList.toggle(\"expanded\");\r\n    let expanded = listItem.classList.contains(\"expanded\");\r\n    let itemType = getTOCItemType(listItem);\r\n\r\n    if (expanded) {\r\n        expander.title = \"Close\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    } else {\r\n        expander.title = \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n    }\r\n\r\n    for (const childUL of listItem.querySelectorAll(\r\n        \":scope > ul.toc-item-list\"\r\n    )) {\r\n        for (const childItem of childUL.querySelectorAll(\r\n            \":scope > li.toc-item\"\r\n        )) {\r\n            if (expanded) {\r\n                childItem.classList.add(\"visible\");\r\n                childItem.classList.remove(\"hidden\");\r\n            } else {\r\n                childItem.classList.remove(\"visible\");\r\n                childItem.classList.add(\"hidden\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initToc() {\r\n    const thetocbutton = document.getElementsByClassName(\"toc-toggle\")[0];\r\n    if (thetocbutton) {\r\n        thetocbutton.addEventListener(\"click\", (e) => {\r\n            toggletoc();\r\n            e.stopPropagation();\r\n        });\r\n    }\r\n\r\n    // Auto-collapse TOC when clicking outside\r\n    if (\r\n        getComputedStyle(document.documentElement).getPropertyValue(\r\n            \"--auto-collapse-toc\"\r\n        ) == \"yes\"\r\n    ) {\r\n        const sidebar = document.getElementById(\"ptx-sidebar\");\r\n\r\n        window.addEventListener(\"click\", function (event) {\r\n            if (sidebar.classList.contains(\"visible\")) {\r\n                if (!event.composedPath().includes(sidebar)) {\r\n                    toggletoc();\r\n                }\r\n            }\r\n        });\r\n\r\n        sidebar.addEventListener(\"click\", function (event) {\r\n            if (samePageLink(event.target.closest(\"a\"))) {\r\n                toggletoc();\r\n            }\r\n        });\r\n\r\n        window.addEventListener(\"pageshow\", (e) => {\r\n            if (e.persisted) {\r\n                sidebar.classList.remove(\"visible\");\r\n                sidebar.classList.add(\"hidden\");\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initFocusedToc() {\r\n    if (document.querySelector(\".ptx-toc.focused\") === null) return;\r\n\r\n    let maxDepth = 1000;\r\n    for (let className of document.querySelector(\".ptx-toc\").classList)\r\n        if (className.length > 5 && className.slice(0, 5) === \"depth\")\r\n            maxDepth = Number(className.slice(5));\r\n\r\n    let preexpandedLevels = 1;\r\n    let tocDataSet = document.querySelector(\".ptx-toc\").dataset;\r\n    if (typeof tocDataSet.preexpandedLevels !== \"undefined\")\r\n        preexpandedLevels = Number(tocDataSet.preexpandedLevels);\r\n\r\n    let tocItems = document.querySelectorAll(\r\n        \".ptx-toc ul.structural > .toc-item\"\r\n    );\r\n    for (const tocItem of tocItems) {\r\n        let hasChildren =\r\n            tocItem.querySelector(\"ul.structural\") !== null;\r\n        let depth = getTOCItemDepth(tocItem);\r\n\r\n        if (hasChildren && depth < maxDepth) {\r\n            let expander = document.createElement(\"button\");\r\n            expander.classList.add(\"toc-expander\");\r\n            expander.classList.add(\"toc-chevron-surround\");\r\n            expander.title = \"toc-expander\";\r\n            expander.innerHTML =\r\n                '<span class=\"icon material-symbols-outlined\" aria-hidden=\"true\"></span>';\r\n            tocItem.querySelector(\".toc-title-box\").append(expander);\r\n            expander.addEventListener(\"click\", () => {\r\n                toggleTOCItem(expander);\r\n            });\r\n\r\n            let isActive =\r\n                tocItem.classList.contains(\"contains-active\") ||\r\n                tocItem.classList.contains(\"active\");\r\n            let preExpanded = isActive || depth < preexpandedLevels;\r\n            let itemType = getTOCItemType(tocItem);\r\n            if (preExpanded) {\r\n                toggleTOCItem(expander);\r\n            } else {\r\n                expander.title =\r\n                    \"Expand\" + (itemType !== \"\" ? \" \" + itemType : \"\");\r\n            }\r\n        }\r\n    }\r\n\r\n    // Expand parents of hash-linked TOC item\r\n    if (window.location.hash) {\r\n        let hash = window.location.hash;\r\n        let hashLink = document.querySelector(\r\n            `.ptx-toc a[href$=\"${hash}\"]`\r\n        );\r\n        if (hashLink) {\r\n            let parentTocItem = hashLink.closest(\".toc-item\");\r\n            while (\r\n                parentTocItem &&\r\n                !parentTocItem.classList.contains(\"contains-active\")\r\n            ) {\r\n                parentTocItem.classList.add(\"contains-active\");\r\n                let expander =\r\n                    parentTocItem.querySelector(\".toc-expander\");\r\n                if (expander) {\r\n                    if (!parentTocItem.classList.contains(\"expanded\")) {\r\n                        toggleTOCItem(expander);\r\n                    }\r\n                }\r\n                parentTocItem =\r\n                    parentTocItem.parentElement.closest(\".toc-item\");\r\n            }\r\n        }\r\n    }\r\n}\r\n\r\nexport function initScrollToc() {\r\n    scrollTocToActive();\r\n    window.onhashchange = scrollTocToActive;\r\n}\r\n", "/**\r\n * Knowl behavior (from knowl.js).\r\n *\r\n * Manages xref knowls and born-hidden knowls: click-to-reveal with\r\n * slide animation, lazy content fetching, and MathJax re-typesetting.\r\n */\r\n\r\n// Used to animate both types of knowls\r\nclass SlideRevealer {\r\n    static STATE = Object.freeze({\r\n        INACTIVE: 0,\r\n        CLOSING: 1,\r\n        EXPANDING: 2,\r\n    });\r\n\r\n    constructor(triggerElement, contentElement, animatedElement) {\r\n        this.triggerElement = triggerElement;\r\n        this.contentElement = contentElement;\r\n        this.animatedElement = animatedElement;\r\n\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        this.triggerElement.addEventListener(\"click\", (e) => this.onClick(e));\r\n    }\r\n\r\n    onClick(e) {\r\n        if (e) e.preventDefault();\r\n        this.animatedElement.style.overflow = \"hidden\";\r\n\r\n        if (\r\n            this.animationState === SlideRevealer.STATE.CLOSING ||\r\n            !this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.animatedElement.setAttribute(\"open\", \"\");\r\n            this.triggerElement.setAttribute(\"open\", \"\");\r\n            this.contentElement.style.display = \"\";\r\n            MathJax.typesetPromise().then(() =>\r\n                window.requestAnimationFrame(() => this.toggle(true))\r\n            );\r\n        } else if (\r\n            this.animationState === SlideRevealer.STATE.EXPANDING ||\r\n            this.animatedElement.hasAttribute(\"open\")\r\n        ) {\r\n            this.toggle(false);\r\n        }\r\n    }\r\n\r\n    toggle(expanding) {\r\n        let closedHeight = 0;\r\n        if (this.animatedElement.contains(this.triggerElement))\r\n            closedHeight = this.triggerElement.offsetHeight;\r\n        const fullHeight = closedHeight + this.contentElement.offsetHeight;\r\n\r\n        const startHeight = `${expanding ? closedHeight : fullHeight}px`;\r\n        const endHeight = `${expanding ? fullHeight : closedHeight}px`;\r\n\r\n        const padding =\r\n            this.animatedElement.offsetHeight -\r\n            this.animatedElement.clientHeight;\r\n        const startPad = `${expanding ? 0 : padding}px`;\r\n        const endPad = `${expanding ? padding : 0}px`;\r\n\r\n        if (this.animation) this.animation.cancel();\r\n\r\n        const animDuration = Math.max(\r\n            Math.min(\r\n                (Math.abs(closedHeight - fullHeight) / 400) * 1000,\r\n                750\r\n            ),\r\n            250\r\n        );\r\n\r\n        this.animationState = expanding\r\n            ? SlideRevealer.STATE.EXPANDING\r\n            : SlideRevealer.STATE.CLOSING;\r\n        this.animation = this.animatedElement.animate(\r\n            {\r\n                height: [startHeight, endHeight],\r\n                paddingTop: [startPad, endPad],\r\n                paddingBottom: [startPad, endPad],\r\n            },\r\n            { duration: animDuration, easing: \"ease\" }\r\n        );\r\n\r\n        this.animation.onfinish = () => {\r\n            this.onAnimationFinish(expanding);\r\n        };\r\n        this.animation.oncancel = () => {\r\n            this.animationState = SlideRevealer.STATE.INACTIVE;\r\n        };\r\n    }\r\n\r\n    onAnimationFinish(isOpen) {\r\n        this.animation = null;\r\n        this.animationState = SlideRevealer.STATE.INACTIVE;\r\n\r\n        if (!isOpen) {\r\n            this.animatedElement.removeAttribute(\"open\");\r\n            this.triggerElement.removeAttribute(\"open\");\r\n        }\r\n\r\n        this.animatedElement.style.overflow = \"\";\r\n        if (!isOpen) this.contentElement.style.display = \"none\";\r\n\r\n        if (isOpen) {\r\n            let hasCallback =\r\n                this.contentElement.querySelectorAll(\r\n                    \"[data-knowl-callback]\"\r\n                );\r\n            hasCallback.forEach((el) => {\r\n                window[el.getAttribute(\"data-knowl-callback\")](el, open);\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nclass LinkKnowl {\r\n    static xrefCount = 0;\r\n\r\n    static initializeXrefKnowl(knowlLinkElement) {\r\n        if (\r\n            knowlLinkElement.getAttribute(\"data-knowl-uid\") === null\r\n        ) {\r\n            return new LinkKnowl(knowlLinkElement);\r\n        }\r\n    }\r\n\r\n    constructor(knowlLinkElement) {\r\n        this.linkElement = knowlLinkElement;\r\n        this.outputElement = null;\r\n        this.uid = LinkKnowl.xrefCount++;\r\n        knowlLinkElement.setAttribute(\"data-knowl-uid\", this.uid);\r\n        knowlLinkElement.setAttribute(\"role\", \"button\");\r\n        knowlLinkElement.setAttribute(\r\n            \"data-base-title\",\r\n            knowlLinkElement.getAttribute(\"title\") ||\r\n                this.linkElement.textContent\r\n        );\r\n        knowlLinkElement.classList.add(\"knowl__link\");\r\n        this.updateLabels(false);\r\n        knowlLinkElement.addEventListener(\r\n            \"click\",\r\n            this.handleLinkClick.bind(this)\r\n        );\r\n    }\r\n\r\n    updateLabels(isVisible) {\r\n        const verb = isVisible\r\n            ? this.linkElement.getAttribute(\"data-close-label\") || \"Close\"\r\n            : this.linkElement.getAttribute(\"data-reveal-label\") ||\r\n              \"Reveal\";\r\n        const targetDescript =\r\n            this.linkElement.getAttribute(\"data-base-title\");\r\n        const helpText = verb + \" \" + targetDescript;\r\n        this.linkElement.setAttribute(\"aria-label\", helpText);\r\n        this.linkElement.setAttribute(\"title\", helpText);\r\n    }\r\n\r\n    toggle() {\r\n        this.linkElement.classList.toggle(\"active\");\r\n        const isActive = this.linkElement.classList.contains(\"active\");\r\n        this.updateLabels(isActive);\r\n\r\n        if (isActive) {\r\n            const h = this.outputElement.getBoundingClientRect().height;\r\n            if (h > window.innerHeight) {\r\n                this.outputElement.scrollIntoView(true);\r\n            } else {\r\n                if (\r\n                    this.outputElement.getBoundingClientRect().bottom >\r\n                    window.innerHeight\r\n                )\r\n                    this.outputElement.scrollIntoView(false);\r\n            }\r\n        }\r\n    }\r\n\r\n    findOutputLocation() {\r\n        const invalidParents =\r\n            \"table, mjx-container, div.tabular-box, .runestone > .parsons\";\r\n        let el = this.linkElement.parentElement;\r\n        let problemAncestor = el.closest(invalidParents);\r\n        while (problemAncestor && problemAncestor !== el) {\r\n            el = problemAncestor;\r\n            problemAncestor = el.closest(invalidParents);\r\n        }\r\n        return el;\r\n    }\r\n\r\n    createOutputElement() {\r\n        const outputId = \"knowl-uid-\" + this.uid;\r\n        const outputContentsId = \"knowl-output-\" + this.uid;\r\n        const linkTarget =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n\r\n        const placeholderText =\r\n            `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>` +\r\n            `Loading '${linkTarget}'` +\r\n            `</div>`;\r\n\r\n        const temp = document.createElement(\"template\");\r\n        temp.innerHTML = placeholderText;\r\n        this.outputElement = temp.content.children[0];\r\n\r\n        const insertLoc = this.findOutputLocation(this.linkElement);\r\n        insertLoc.after(this.outputElement);\r\n    }\r\n\r\n    async getContent() {\r\n        const contentURL =\r\n            this.linkElement.getAttribute(\"data-knowl\");\r\n        const knowlContent = await fetch(contentURL)\r\n            .then((response) => response.text())\r\n            .then((data) => {\r\n                let knowlDoc = new DOMParser().parseFromString(\r\n                    data,\r\n                    \"text/html\"\r\n                );\r\n                let tempContainer = knowlDoc.body;\r\n                let scripts = knowlDoc.querySelectorAll(\"head script\");\r\n                tempContainer.append(...scripts);\r\n                return tempContainer;\r\n            })\r\n            .catch((error) => {\r\n                const destination =\r\n                    this.linkElement.getAttribute(\"href\");\r\n                const text = this.linkElement.textContent;\r\n                const err_message =\r\n                    `<div class='knowl-output__error'>` +\r\n                    `<div class='para'>Error fetching content. (<em>${error}</em>)</div>` +\r\n                    `<div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div>` +\r\n                    `<div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href=\"https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally\">PreTeXt FAQ</a> for more information.</div>` +\r\n                    `</div>`;\r\n                return err_message;\r\n            });\r\n        return knowlContent;\r\n    }\r\n\r\n    handleLinkClick(event) {\r\n        event.preventDefault();\r\n\r\n        if (this.outputElement !== null) {\r\n            this.toggle();\r\n        } else {\r\n            this.createOutputElement();\r\n\r\n            const slideHandler = new SlideRevealer(\r\n                this.linkElement,\r\n                this.outputElement,\r\n                this.outputElement\r\n            );\r\n            this.linkElement.addEventListener(\"click\", slideHandler);\r\n\r\n            let loadingTimeout = setTimeout(() => {\r\n                loadingTimeout = null;\r\n                slideHandler.onClick();\r\n                this.toggle();\r\n            }, 500);\r\n\r\n            const content = this.getContent();\r\n\r\n            content\r\n                .then((tempContainer) => {\r\n                    if (loadingTimeout !== null) {\r\n                        clearTimeout(loadingTimeout);\r\n                    }\r\n                    setTimeout(() => {\r\n                        slideHandler.onClick();\r\n                        this.toggle();\r\n                    }, 100);\r\n\r\n                    const runestoneElements =\r\n                        tempContainer.querySelectorAll(\r\n                            \".ptx-runestone-container\"\r\n                        );\r\n                    [...runestoneElements].forEach((e) => {\r\n                        const rsId =\r\n                            e.querySelector(\"[data-component]\")?.id;\r\n                        const onPage = document.getElementById(rsId);\r\n                        if (onPage) {\r\n                            e.innerHTML = `<div class=\"para\">The interactive that belongs here is already on the page and cannot appear multiple times. <a href=\"#${rsId}\">Scroll to interactive.</a>`;\r\n                        } else {\r\n                            window.runestoneComponents.renderOneComponent(\r\n                                e\r\n                            );\r\n                        }\r\n                    });\r\n\r\n                    const children = [...tempContainer.children];\r\n                    this.outputElement.innerHTML = \"\";\r\n                    this.outputElement.append(...children);\r\n\r\n                    addKnowls(this.outputElement);\r\n                    Prism.highlightAllUnder(this.outputElement);\r\n\r\n                    [\r\n                        ...this.outputElement.getElementsByTagName(\r\n                            \"script\"\r\n                        ),\r\n                    ].forEach((s) => {\r\n                        if (\r\n                            s.getAttribute(\"type\") === null ||\r\n                            s.getAttribute(\"type\") ===\r\n                                \"text/javascript\"\r\n                        ) {\r\n                            eval(s.innerHTML);\r\n                        }\r\n                    });\r\n                })\r\n                .catch((data) => {\r\n                    console.log(\r\n                        \"Error fetching knowl content: \" + data\r\n                    );\r\n                });\r\n        }\r\n    }\r\n}\r\n\r\nexport function addKnowls(target) {\r\n    const xrefs = target.querySelectorAll(\"[data-knowl]\");\r\n    for (const xref of xrefs) {\r\n        LinkKnowl.initializeXrefKnowl(xref);\r\n    }\r\n\r\n    const bornHiddens = target.querySelectorAll(\".born-hidden-knowl\");\r\n    for (const bhk of bornHiddens) {\r\n        const summary = bhk.querySelector(\":scope > summary\");\r\n        if (!summary) continue;\r\n        const contents = bhk.querySelector(\":scope > summary + *\");\r\n        new SlideRevealer(summary, contents, bhk);\r\n    }\r\n}\r\n\r\nexport function initKnowls() {\r\n    addKnowls(document);\r\n}\r\n", "/**\r\n * LTI iframe resizer (from lti_iframe_resizer.js).\r\n *\r\n * Handles SPLICE resize messages from embedded iframes (e.g. MyOpenMath),\r\n * adjusting iframe dimensions based on postMessage events.\r\n *\r\n * @see https://cssplice.org/\r\n */\r\n\r\nexport function sendResizeRequest(el) {\r\n    el.contentWindow.postMessage(\"requestResize\", \"*\");\r\n}\r\n\r\nexport function initLtiIframeResizer() {\r\n    window.addEventListener(\"message\", function (event) {\r\n        let edata = event.data;\r\n\r\n        // MoM sends event.data as a string instead of JSON\r\n        if (\r\n            typeof event.data == \"string\" &&\r\n            event.data.match(/lti\\.frameResize/)\r\n        ) {\r\n            edata = JSON.parse(event.data);\r\n        }\r\n\r\n        if (edata.subject === \"lti.frameResize\") {\r\n            if (\"frame_id\" in edata) {\r\n                const el = document.getElementById(edata[\"frame_id\"]);\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n                if (\r\n                    edata.wrapheight &&\r\n                    document.getElementById(edata[\"frame_id\"] + \"wrap\")\r\n                ) {\r\n                    document.getElementById(\r\n                        edata[\"frame_id\"] + \"wrap\"\r\n                    ).style.height = edata.wrapheight + \"px\";\r\n                }\r\n            } else if (\"iframe_resize_id\" in edata) {\r\n                const el = document.getElementById(\r\n                    edata[\"iframe_resize_id\"]\r\n                );\r\n                if (el) {\r\n                    el.style.height = edata.height + \"px\";\r\n                }\r\n            } else {\r\n                const iFrames =\r\n                    document.getElementsByTagName(\"iframe\");\r\n                for (const iFrame of iFrames) {\r\n                    if (iFrame.contentWindow === event.source) {\r\n                        if (edata.height) {\r\n                            iFrame.height = edata.height;\r\n                            iFrame.style.height = edata.height + \"px\";\r\n                        }\r\n                        if (edata.width) {\r\n                            iFrame.width = edata.width;\r\n                            iFrame.style.width = edata.width + \"px\";\r\n                        }\r\n                        break;\r\n                    }\r\n                }\r\n            }\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Permalink copy-to-clipboard functionality.\r\n *\r\n * Copies permalink URLs to the clipboard using the Clipboard API,\r\n * with a brief visual confirmation message.\r\n */\r\n\r\nasync function copyPermalink(linkNode) {\r\n    if (!navigator.clipboard) {\r\n        console.log(\"Error: Clipboard API not available\");\r\n        return;\r\n    }\r\n    const elem = linkNode.parentElement;\r\n    if (!linkNode) {\r\n        console.log(\"Error: Something went wrong finding permalink URL\");\r\n        return;\r\n    }\r\n    const url = linkNode.href;\r\n    const description = elem.getAttribute(\"data-description\");\r\n    const link = `<a href=\"${url}\">${description}</a>`;\r\n    const msgLink = `<a class=\"internal\" href=\"${url}\">${description}</a>`;\r\n    const textFallback = description + \" \\r\\n\" + url;\r\n    let copySuccess = true;\r\n\r\n    try {\r\n        // NOTE: this method will only work in Firefox if the user has\r\n        //    dom.events.asyncClipboard.clipboardItem\r\n        // set to true in their about:config.\r\n        await navigator.clipboard.write([\r\n            new ClipboardItem({\r\n                \"text/html\": new Blob([link], { type: \"text/html\" }),\r\n                \"text/plain\": new Blob([textFallback], { type: \"text/plain\" }),\r\n            }),\r\n        ]);\r\n    } catch (err) {\r\n        console.log(\r\n            \"Permalink-to-clipboard using ClipboardItem failed, falling back to clipboard.writeText\",\r\n            err\r\n        );\r\n        copySuccess = false;\r\n    }\r\n\r\n    if (!copySuccess) {\r\n        try {\r\n            await navigator.clipboard.writeText(textFallback);\r\n        } catch (err) {\r\n            console.log(\r\n                \"Permalink-to-clipboard using clipboard.writeText failed\",\r\n                err\r\n            );\r\n            console.error(\"Failed to copy link to clipboard!\");\r\n            return;\r\n        }\r\n    }\r\n\r\n    console.log(`copied '${url}' to clipboard`);\r\n    const copiedMsg = document.createElement(\"p\");\r\n    copiedMsg.setAttribute(\"role\", \"alert\");\r\n    copiedMsg.className = \"permalink-alert\";\r\n    copiedMsg.innerHTML = \"Link to \" + msgLink + \" copied to clipboard\";\r\n    elem.parentElement.insertBefore(copiedMsg, elem);\r\n    await new Promise((resolve) => setTimeout(resolve, 1500));\r\n    copiedMsg.remove();\r\n}\r\n\r\nexport function initPermalinks() {\r\n    const permalinks = document.querySelectorAll(\".autopermalink > a\");\r\n    permalinks.forEach((link) => {\r\n        link.addEventListener(\"click\", function (event) {\r\n            event.preventDefault();\r\n            copyPermalink(link);\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Image magnification (click-to-zoom).\r\n *\r\n * Clicking an eligible image creates a full-width popup; clicking the\r\n * popup dismisses it.  Uses event delegation on the document body.\r\n */\r\n\r\n/**\r\n * Walk up from `el` through ancestors, collecting those that match `selector`.\r\n * Returns the *last* (outermost) match \u2014 equivalent to jQuery's\r\n * `.parents(selector).last()`.\r\n */\r\nfunction outermostMatchingAncestor(el, selector) {\r\n    let match = null;\r\n    let current = el.parentElement;\r\n    while (current) {\r\n        if (current.matches(selector)) {\r\n            match = current;\r\n        }\r\n        current = current.parentElement;\r\n    }\r\n    return match;\r\n}\r\n\r\nexport function initImageMagnify() {\r\n    const imgSelector =\r\n        \".image-box > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \".sbspanel > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > img:not(.draw_on_me):not(.mag_popup), \" +\r\n        \"figure > div > img:not(.draw_on_me):not(.mag_popup)\";\r\n\r\n    // Click an image to magnify\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const img = event.target.closest(imgSelector);\r\n        if (!img) return;\r\n\r\n        const container = document.createElement(\"div\");\r\n        container.setAttribute(\"style\", \"background:#fff;\");\r\n        container.setAttribute(\"class\", \"mag_popup_container\");\r\n        container.innerHTML =\r\n            '<img src=\"' +\r\n            img.src +\r\n            '\" style=\"width:100%\" class=\"mag_popup\"/>';\r\n\r\n        let placement = outermostMatchingAncestor(\r\n            img,\r\n            \".image-box, .sbsrow, figure, li, .cols2 article:nth-of-type(2n)\"\r\n        );\r\n\r\n        // For .cols2, even articles go inside the previous odd one\r\n        if (placement && placement.tagName === \"ARTICLE\") {\r\n            const prev = placement.previousElementSibling;\r\n            if (prev) {\r\n                placement = prev.firstElementChild || prev;\r\n            }\r\n        }\r\n\r\n        if (placement) {\r\n            placement.parentNode.insertBefore(container, placement);\r\n        }\r\n    });\r\n\r\n    // Click the big image to dismiss it\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        if (event.target.classList.contains(\"mag_popup\")) {\r\n            event.target.parentNode.remove();\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Scrollbar width detection utility.\r\n *\r\n * \u26A0\uFE0F DEPRECATED: Only used by the GeoGebra calculator integration.\r\n * Consider replacing with a CSS-based approach in the future.\r\n *\r\n * @see https://stackoverflow.com/questions/13382516/getting-scroll-bar-width-using-javascript\r\n */\r\n\r\nexport function getScrollbarWidth() {\r\n    const outer = document.createElement(\"div\");\r\n    outer.style.visibility = \"hidden\";\r\n    outer.style.width = \"100px\";\r\n    outer.style.msOverflowStyle = \"scrollbar\"; // needed for WinJS apps\r\n\r\n    document.body.appendChild(outer);\r\n\r\n    const widthNoScroll = outer.offsetWidth;\r\n    outer.style.overflow = \"scroll\";\r\n\r\n    const inner = document.createElement(\"div\");\r\n    inner.style.width = \"100%\";\r\n    outer.appendChild(inner);\r\n\r\n    const widthWithScroll = inner.offsetWidth;\r\n    outer.parentNode.removeChild(outer);\r\n\r\n    return widthNoScroll - widthWithScroll;\r\n}\r\n", "/**\r\n * GeoGebra calculator integration.\r\n *\r\n * Manages the floating GeoGebra calculator overlay: toggling visibility,\r\n * preventing body scroll while hovering the canvas, and injecting the\r\n * GeoGebra applet script on first open.\r\n */\r\n\r\nimport { getScrollbarWidth } from \"./deprecated/scrollbar-width.js\";\r\n\r\nfunction calculatorOnload() {\r\n    const toggle = document.getElementById(\"calculator-toggle\");\r\n    if (toggle) toggle.focus();\r\n    const inputField = document.querySelector(\r\n        \"input.gwt-SuggestBox.TextField\"\r\n    );\r\n    if (inputField) inputField.focus();\r\n}\r\n\r\nexport function initGeoGebra() {\r\n    const scrollWidth = getScrollbarWidth();\r\n    const calcOffsetR = 5;\r\n    const calcOffsetB = 5;\r\n\r\n    // Prevent body scroll when hovering the GeoGebra canvas\r\n    document.body.addEventListener(\"mouseover\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"hidden\";\r\n        document.documentElement.style.marginRight = \"15px\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + scrollWidth + \"px\";\r\n            container.style.bottom = calcOffsetB + scrollWidth + \"px\";\r\n        }\r\n    });\r\n\r\n    document.body.addEventListener(\"mouseout\", function (event) {\r\n        if (!event.target.closest(\"#geogebra-calculator canvas\")) return;\r\n        document.body.style.overflow = \"scroll\";\r\n        document.documentElement.style.marginRight = \"0\";\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (container) {\r\n            container.style.right = calcOffsetR + \"px\";\r\n            container.style.bottom = calcOffsetB + \"px\";\r\n        }\r\n    });\r\n\r\n    // Toggle calculator visibility\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const toggle = event.target.closest(\"#calculator-toggle\");\r\n        if (!toggle) return;\r\n\r\n        const container = document.getElementById(\"calculator-container\");\r\n        if (!container) return;\r\n\r\n        if (container.style.display === \"none\" || !container.style.display) {\r\n            container.style.display = \"block\";\r\n            toggle.classList.add(\"open\");\r\n            toggle.setAttribute(\"title\", \"Hide calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"true\");\r\n\r\n            const existingScript = document.getElementById(\"create_ggb_calc\");\r\n            if (!existingScript) {\r\n                const ggbScript = document.createElement(\"script\");\r\n                ggbScript.id = \"create_ggb_calc\";\r\n                ggbScript.innerHTML = \"ggbApp.inject('geogebra-calculator')\";\r\n                document.body.appendChild(ggbScript);\r\n            } else {\r\n                calculatorOnload();\r\n            }\r\n        } else {\r\n            container.style.display = \"none\";\r\n            toggle.classList.remove(\"open\");\r\n            toggle.setAttribute(\"title\", \"Show calculator\");\r\n            toggle.setAttribute(\"aria-expanded\", \"false\");\r\n        }\r\n    });\r\n}\r\n", "/**\r\n * Keyboard navigation handlers.\r\n *\r\n * - ENTER in a `.workspace` triggers MathJax typesetting.\r\n * - ESC navigates back through Sage cell focus, then up the knowl stack,\r\n *   or does nothing if no interactive context is active.\r\n * - Hash-based anchor navigation: opens knowls linked via URL hash.\r\n */\r\n\r\nlet justHitEscape = false;\r\n\r\nfunction processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n\r\nexport function initKeyboardNav() {\r\n    document.onkeyup = function (event) {\r\n        const e = event || window.event;\r\n        switch (e.keyCode) {\r\n            case 13: // ENTER\r\n                justHitEscape = false;\r\n                if (\r\n                    document.activeElement.classList.contains(\"workspace\")\r\n                ) {\r\n                    processWorkspace();\r\n                }\r\n                break; // Fixed: was missing, caused fallthrough to ESC handler\r\n\r\n            case 27: // ESC\r\n            {\r\n                const parentSageCell =\r\n                    document.activeElement.closest(\".sagecell_editor\");\r\n                if (parentSageCell && !justHitEscape) {\r\n                    justHitEscape = true;\r\n                    setTimeout(function () {\r\n                        justHitEscape = false;\r\n                    }, 1000);\r\n                }\r\n                // knowl_focus_stack is defined in knowl.js and may not exist\r\n                // in all contexts \u2014 guard against ReferenceError\r\n                else if (\r\n                    typeof knowl_focus_stack !== \"undefined\" &&\r\n                    knowl_focus_stack.length > 0\r\n                ) {\r\n                    const mostRecentlyOpened = knowl_focus_stack.pop();\r\n                    if (typeof knowl_focus_stack_uid !== \"undefined\") {\r\n                        knowl_focus_stack_uid.pop();\r\n                    }\r\n                    mostRecentlyOpened.focus();\r\n                } else {\r\n                    break;\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    };\r\n}\r\n\r\nexport function initAnchorKnowl() {\r\n    if (!window.location.hash.length) return;\r\n\r\n    const id = window.location.hash.substring(1);\r\n    const anchor = document.getElementById(id);\r\n    if (!anchor) return;\r\n\r\n    if (anchor.tagName === \"ARTICLE\") {\r\n        const containedKnowl = anchor.querySelector(\"a[data-knowl]\");\r\n        if (containedKnowl && containedKnowl.parentElement === anchor) {\r\n            containedKnowl.click();\r\n        }\r\n    } else if (anchor.hasAttribute(\"data-knowl\")) {\r\n        anchor.click();\r\n    } else {\r\n        // If it is a hidden knowl, find the knowl and open it\r\n        const hiddenContent = anchor.closest(\".hidden-content\");\r\n        if (hiddenContent) {\r\n            const refId = hiddenContent.id;\r\n            const knowl = document.querySelector(\r\n                '[data-refid=\"' + refId + '\"]'\r\n            );\r\n            if (knowl) knowl.click();\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview page geometry helpers.\r\n *\r\n * Utilities for converting CSS units to pixels, computing element heights,\r\n * and injecting dynamic @page / CSS-variable rules.\r\n */\r\n\r\nexport function toPixels(value) {\r\n    if (typeof value === \"number\") return value;\r\n    if (typeof value !== \"string\") return 0;\r\n    value = value.trim();\r\n    if (value.endsWith(\"px\")) {\r\n        return parseFloat(value);\r\n    } else if (value.endsWith(\"in\")) {\r\n        return Math.floor(parseFloat(value) * 96);\r\n    } else if (value.endsWith(\"cm\")) {\r\n        return Math.floor(parseFloat(value) * 37.8);\r\n    } else if (value.endsWith(\"mm\")) {\r\n        return Math.floor(parseFloat(value) * 3.78);\r\n    } else if (value.endsWith(\"pt\")) {\r\n        return Math.floor(parseFloat(value) * (96 / 72));\r\n    } else {\r\n        return parseFloat(value) || 0;\r\n    }\r\n}\r\n\r\nexport function getElementTotalHeight(elem) {\r\n    const style = getComputedStyle(elem);\r\n    const marginTop = parseFloat(style.marginTop);\r\n    const marginBottom = parseFloat(style.marginBottom);\r\n    const height = elem.offsetHeight;\r\n    return height + marginTop + marginBottom;\r\n}\r\n\r\nexport function getElemWorkspaceHeight(elem) {\r\n    if (elem.classList.contains(\"sidebyside\")) {\r\n        const sbspanels = elem.querySelectorAll(\".sbspanel\");\r\n        let max = 0;\r\n        sbspanels.forEach((panel) => {\r\n            const workspaces = panel.querySelectorAll(\".workspace\");\r\n            let totalHeight = 0;\r\n            workspaces.forEach((workspace) => {\r\n                const workspaceHeight = workspace.offsetHeight;\r\n                if (workspaceHeight) {\r\n                    totalHeight += workspaceHeight;\r\n                }\r\n            });\r\n            if (totalHeight > max) {\r\n                max = totalHeight;\r\n            }\r\n        });\r\n        return max;\r\n    }\r\n\r\n    let columns = 1;\r\n    if (elem.classList.contains(\"exercisegroup\")) {\r\n        for (let i = 2; i <= 6; i++) {\r\n            if (elem.querySelector(`.cols${i}`)) {\r\n                columns = i;\r\n                break;\r\n            }\r\n        }\r\n    }\r\n    const workspaces = elem.querySelectorAll(\".workspace\");\r\n    let totalHeight = 0;\r\n    workspaces.forEach((ws) => {\r\n        const workspaceHeight = ws.offsetHeight;\r\n        if (workspaceHeight) {\r\n            totalHeight += workspaceHeight;\r\n        }\r\n    });\r\n    return totalHeight / columns;\r\n}\r\n\r\nexport function setPageGeometryCSS({ paperSize, margins }) {\r\n    const existingStyle = document.getElementById(\"page-geometry-css\");\r\n    if (existingStyle) {\r\n        existingStyle.remove();\r\n    }\r\n    const wsWidth = paperSize === \"letter\" ? \"816px\" : \"794px\";\r\n    const wsHeight = paperSize === \"letter\" ? \"1056px\" : \"1123px\";\r\n\r\n    const style = document.createElement(\"style\");\r\n    style.id = \"page-geometry-css\";\r\n    style.textContent = `\r\n        :root {\r\n            --ws-width: ${wsWidth};\r\n            --ws-height: ${wsHeight};\r\n            --ws-top-margin: ${margins.top}px;\r\n            --ws-right-margin: ${margins.right}px;\r\n            --ws-bottom-margin: ${margins.bottom}px;\r\n            --ws-left-margin: ${margins.left}px;\r\n        }\r\n        @page {\r\n            margin: var(--ws-top-margin, ${margins.top}px) var(--ws-right-margin, ${margins.right}px) var(--ws-bottom-margin, ${margins.bottom}px) var(--ws-left-margin, ${margins.left}px);\r\n        }\r\n    `;\r\n    document.head.appendChild(style);\r\n}\r\n", "/**\r\n * Print-preview workspace height management.\r\n *\r\n * Handles setting initial workspace heights from data attributes,\r\n * adjusting heights to fit pages, highlighting workspace areas,\r\n * and MathJax re-typesetting on workspace edits.\r\n */\r\n\r\nimport { getElementTotalHeight, getElemWorkspaceHeight } from \"./geometry.js\";\r\n\r\nexport function setInitialWorkspaceHeights() {\r\n    const workspaces = document.querySelectorAll(\".workspace\");\r\n    workspaces.forEach((ws) => {\r\n        ws.style.height = ws.getAttribute(\"data-space\") || \"0px\";\r\n        ws.setAttribute(\"contenteditable\", \"true\");\r\n    });\r\n}\r\n\r\nexport function adjustWorkspaceToFitPage({ paperSize, margins }) {\r\n    // Toggle off workspace highlight if it is on\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    const wasHighlighted = highlightCheckbox && highlightCheckbox.checked;\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(false);\r\n    }\r\n\r\n    let paperWidth, paperHeight;\r\n    if (paperSize === \"a4\" || document.body.classList.contains(\"a4\")) {\r\n        paperWidth = 794;\r\n        paperHeight = 1122.5;\r\n    } else {\r\n        paperWidth = 816;\r\n        paperHeight = 1056;\r\n    }\r\n    const paperContentHeight = paperHeight - (margins.top + margins.bottom);\r\n\r\n    setInitialWorkspaceHeights();\r\n\r\n    const pages = document.querySelectorAll(\".onepage\");\r\n    pages.forEach((page) => {\r\n        page.style.width = paperWidth + \"px\";\r\n        const rows = page.children;\r\n        let totalContentHeight = 0;\r\n        let totalWorkspaceHeight = 0;\r\n        for (const row of rows) {\r\n            totalContentHeight += getElementTotalHeight(row);\r\n            totalWorkspaceHeight += getElemWorkspaceHeight(row);\r\n        }\r\n        if (totalWorkspaceHeight === 0) {\r\n            page.style.width = \"\";\r\n            return;\r\n        }\r\n        const extraHeight = paperContentHeight - totalContentHeight;\r\n        const workspaceAdjustmentFactor =\r\n            (totalWorkspaceHeight + extraHeight) / totalWorkspaceHeight;\r\n        const pageWorkspaces = page.querySelectorAll(\".workspace\");\r\n        pageWorkspaces.forEach((ws) => {\r\n            const originalHeight = ws.offsetHeight;\r\n            const newHeight = originalHeight * workspaceAdjustmentFactor;\r\n            ws.style.height = newHeight + \"px\";\r\n        });\r\n        page.style.width = \"\";\r\n    });\r\n\r\n    if (wasHighlighted) {\r\n        toggleWorkspaceHighlight(true);\r\n    }\r\n}\r\n\r\nexport function toggleWorkspaceHighlight(isChecked) {\r\n    if (isChecked) {\r\n        document.body.classList.add(\"highlight-workspace\");\r\n        if (!document.querySelector(\".workspace-container\")) {\r\n            document.querySelectorAll(\".workspace\").forEach((workspace) => {\r\n                const container = document.createElement(\"div\");\r\n                container.classList.add(\"workspace-container\");\r\n                container.style.height =\r\n                    window.getComputedStyle(workspace).height;\r\n                const original = document.createElement(\"div\");\r\n                original.classList.add(\"original-workspace\");\r\n                const originalHeight =\r\n                    workspace.getAttribute(\"data-space\") || \"0px\";\r\n                original.setAttribute(\r\n                    \"title\",\r\n                    \"Author-specified workspace height (\" +\r\n                        originalHeight +\r\n                        \")\"\r\n                );\r\n                original.style.height = originalHeight;\r\n                container.appendChild(original);\r\n                if (original.offsetHeight > workspace.offsetHeight) {\r\n                    original.classList.add(\"warning\");\r\n                }\r\n                workspace.parentNode.insertBefore(container, workspace);\r\n                container.appendChild(workspace);\r\n            });\r\n        }\r\n    } else {\r\n        document.body.classList.remove(\"highlight-workspace\");\r\n        document\r\n            .querySelectorAll(\".workspace-container\")\r\n            .forEach((container) => {\r\n                const workspace = container.querySelector(\".workspace\");\r\n                container.parentNode.insertBefore(workspace, container);\r\n                container.remove();\r\n            });\r\n    }\r\n}\r\n\r\nexport function processWorkspace() {\r\n    if (typeof MathJax !== \"undefined\" && MathJax.typesetPromise) {\r\n        MathJax.typesetPromise();\r\n    }\r\n}\r\n", "/**\r\n * Dynamic-programming page-break algorithm.\r\n *\r\n * Given a list of content blocks with heights and workspace heights,\r\n * finds page-break positions that minimize leftover whitespace variance\r\n * across pages.\r\n */\r\n\r\nexport function findPageBreaks(rows, pageHeight) {\r\n    let pageBreaks = [];\r\n    let minCost = Array(rows.length + 1).fill(Infinity);\r\n    minCost[rows.length] = 0;\r\n    let nextPageBreak = Array(rows.length).fill(-1);\r\n\r\n    for (let i = rows.length - 1; i >= 0; i--) {\r\n        let cumulativeHeight = 0;\r\n        for (let j = i; j < rows.length; j++) {\r\n            cumulativeHeight += rows[j].height;\r\n            if (cumulativeHeight > pageHeight) {\r\n                if (j === i) {\r\n                    // Single row exceeds page height \u2014 give it its own page\r\n                    minCost[i] = 0;\r\n                    nextPageBreak[i] = i + 1;\r\n                }\r\n                break;\r\n            }\r\n\r\n            const cost =\r\n                (pageHeight - cumulativeHeight) ** 2 + minCost[j + 1];\r\n            if (cost < minCost[i]) {\r\n                minCost[i] = cost;\r\n                nextPageBreak[i] = j + 1;\r\n            }\r\n        }\r\n    }\r\n\r\n    // Backtrack: row 0 is always a title sharing the first page with row 1\r\n    let nextPage = 1;\r\n    while (nextPage < rows.length) {\r\n        pageBreaks.push(nextPageBreak[nextPage]);\r\n        nextPage = nextPageBreak[nextPage];\r\n    }\r\n    return pageBreaks;\r\n}\r\n", "/**\r\n * Print-preview page creation and adjustment.\r\n *\r\n * Handles flattening paragraph sections, waiting for images,\r\n * adjusting pre-existing pages, and algorithmically creating\r\n * new page divisions for printout content.\r\n */\r\n\r\nimport {\r\n    getElementTotalHeight,\r\n    getElemWorkspaceHeight,\r\n} from \"./geometry.js\";\r\nimport { setInitialWorkspaceHeights } from \"./workspace.js\";\r\nimport { findPageBreaks } from \"./page-breaks.js\";\r\n\r\nexport function flattenParagraphsSections(printout) {\r\n    const paragraphsSections = printout.querySelectorAll(\r\n        \"section.paragraphs\"\r\n    );\r\n    paragraphsSections.forEach((section) => {\r\n        const parent = section.parentNode;\r\n        while (section.firstChild) {\r\n            parent.insertBefore(section.firstChild, section);\r\n        }\r\n        parent.removeChild(section);\r\n    });\r\n}\r\n\r\nexport function waitForImages(container, timeoutMs = 5000) {\r\n    const images = container.querySelectorAll(\"img\");\r\n    const promises = [];\r\n    for (const img of images) {\r\n        if (!img.complete) {\r\n            promises.push(\r\n                new Promise((resolve) => {\r\n                    img.addEventListener(\"load\", resolve, { once: true });\r\n                    img.addEventListener(\"error\", resolve, { once: true });\r\n                })\r\n            );\r\n        }\r\n    }\r\n    if (promises.length === 0) return Promise.resolve();\r\n    return Promise.race([\r\n        Promise.all(promises),\r\n        new Promise((resolve) => setTimeout(resolve, timeoutMs)),\r\n    ]);\r\n}\r\n\r\nexport function adjustPrintoutPages() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    if (pages.length === 0) return;\r\n\r\n    const firstPage = pages[0];\r\n    const lastPage = pages[pages.length - 1];\r\n\r\n    // Move all children before the first page into the first page\r\n    const pageFirstChild = firstPage.firstChild;\r\n    let currentChild = printout.firstChild;\r\n    while (currentChild && currentChild !== firstPage) {\r\n        const nextChild = currentChild.nextSibling;\r\n        firstPage.insertBefore(currentChild, pageFirstChild);\r\n        currentChild = nextChild;\r\n    }\r\n\r\n    // Move all children after the last page into the last page\r\n    let nextChild = lastPage.nextSibling;\r\n    while (nextChild) {\r\n        const tempChild = nextChild;\r\n        nextChild = nextChild.nextSibling;\r\n        lastPage.appendChild(tempChild);\r\n    }\r\n}\r\n\r\nexport function createPrintoutPages(margins) {\r\n    const conservativeContentHeight = 1056 - (margins.top + margins.bottom);\r\n    const conservativeContentWidth = 794 - (margins.left + margins.right);\r\n\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    printout.style.width =\r\n        (conservativeContentWidth + margins.left + margins.right).toString() +\r\n        \"px\";\r\n    setInitialWorkspaceHeights(printout);\r\n\r\n    // Build list of blocks, handling sidebyside and tasks\r\n    let rows = [];\r\n    for (const child of printout.children) {\r\n        if (child.classList.contains(\"sidebyside\")) {\r\n            rows.push(child);\r\n        } else if (child.querySelector(\".task\")) {\r\n            rows.push(child);\r\n            const tasks = child.querySelectorAll(\".task, .conclusion\");\r\n\r\n            for (let i = 0; i < tasks.length; i++) {\r\n                let parent = tasks[i].parentElement;\r\n                let grandparent = parent.parentElement;\r\n                if (grandparent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subsubtask\");\r\n                } else if (parent.classList.contains(\"task\")) {\r\n                    tasks[i].classList.add(\"subtask\");\r\n                }\r\n            }\r\n            for (let i = tasks.length - 1; i > 0; i--) {\r\n                printout.insertBefore(tasks[i], child.nextSibling);\r\n            }\r\n        } else {\r\n            rows.push(child);\r\n        }\r\n    }\r\n\r\n    // Build block list with height info\r\n    let blockList = [];\r\n    for (const row of rows) {\r\n        let blockHeight = getElementTotalHeight(row);\r\n        if (blockHeight === 0) continue;\r\n\r\n        let totalWorkspaceHeight = 0;\r\n        if (row.querySelector(\".workspace\")) {\r\n            totalWorkspaceHeight = getElemWorkspaceHeight(row);\r\n        }\r\n        blockList.push({\r\n            elem: row,\r\n            height: blockHeight,\r\n            workspaceHeight: totalWorkspaceHeight,\r\n        });\r\n    }\r\n\r\n    const pageBreaks = findPageBreaks(blockList, conservativeContentHeight);\r\n\r\n    // Create page divs\r\n    for (let i = 0; i < pageBreaks.length; i++) {\r\n        const pageDiv = document.createElement(\"section\");\r\n        pageDiv.classList.add(\"onepage\");\r\n        if (i === 0) pageDiv.classList.add(\"firstpage\");\r\n        if (i === pageBreaks.length - 1) pageDiv.classList.add(\"lastpage\");\r\n\r\n        const start = pageBreaks[i - 1] || 0;\r\n        const end = pageBreaks[i];\r\n        for (let j = start; j < end; j++) {\r\n            pageDiv.appendChild(blockList[j].elem);\r\n        }\r\n        printout.appendChild(pageDiv);\r\n    }\r\n\r\n    // Remove content not in a page\r\n    for (const child of Array.from(printout.children)) {\r\n        if (!child.classList.contains(\"onepage\")) {\r\n            printout.removeChild(child);\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Print-preview header and footer management.\r\n *\r\n * Adds editable header/footer divs to each page, populates them from\r\n * localStorage or data attributes, and persists edits back to localStorage.\r\n */\r\n\r\nexport function addHeadersAndFootersToPrintout() {\r\n    const printout = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (!printout) return;\r\n\r\n    const pages = printout.querySelectorAll(\".onepage\");\r\n    pages.forEach((page, index) => {\r\n        const isFirstPage = index === 0;\r\n\r\n        const headerDiv = document.createElement(\"div\");\r\n        headerDiv.classList.add(\r\n            isFirstPage ? \"first-page-header\" : \"running-header\",\r\n            \"hidden\"\r\n        );\r\n        headerDiv.innerHTML = `<div class=\"header-left\" contenteditable=\"true\"></div><div class=\"header-center\" contenteditable=\"true\"></div><div class=\"header-right\" contenteditable=\"true\"></div>`;\r\n        page.insertBefore(headerDiv, page.firstChild);\r\n\r\n        const footerDiv = document.createElement(\"div\");\r\n        footerDiv.classList.add(\r\n            isFirstPage ? \"first-page-footer\" : \"running-footer\",\r\n            \"hidden\"\r\n        );\r\n        footerDiv.innerHTML = `<div class=\"footer-left\" contenteditable=\"true\"></div><div class=\"footer-center\" contenteditable=\"true\"></div><div class=\"footer-right\" contenteditable=\"true\"></div>`;\r\n        page.appendChild(footerDiv);\r\n    });\r\n\r\n    // Populate from localStorage or data attributes\r\n    const keys = [\r\n        \"header-first-left\",\r\n        \"header-first-center\",\r\n        \"header-first-right\",\r\n        \"footer-first-left\",\r\n        \"footer-first-center\",\r\n        \"footer-first-right\",\r\n        \"header-running-left\",\r\n        \"header-running-center\",\r\n        \"header-running-right\",\r\n        \"footer-running-left\",\r\n        \"footer-running-center\",\r\n        \"footer-running-right\",\r\n    ];\r\n\r\n    const content = {};\r\n    keys.forEach((key) => {\r\n        content[key] =\r\n            localStorage.getItem(key) ||\r\n            printout.getAttribute(`data-${key}`) ||\r\n            \"\";\r\n    });\r\n\r\n    // First page\r\n    const firstHeader = document.querySelector(\".first-page-header\");\r\n    if (firstHeader) {\r\n        firstHeader.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-first-left\"];\r\n        firstHeader.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-first-center\"];\r\n        firstHeader.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-first-right\"];\r\n    }\r\n    const firstFooter = document.querySelector(\".first-page-footer\");\r\n    if (firstFooter) {\r\n        firstFooter.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-first-left\"];\r\n        firstFooter.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-first-center\"];\r\n        firstFooter.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-first-right\"];\r\n    }\r\n\r\n    // Running headers and footers\r\n    document.querySelectorAll(\".running-header\").forEach((headerDiv) => {\r\n        headerDiv.querySelector(\".header-left\").innerHTML =\r\n            content[\"header-running-left\"];\r\n        headerDiv.querySelector(\".header-center\").innerHTML =\r\n            content[\"header-running-center\"];\r\n        headerDiv.querySelector(\".header-right\").innerHTML =\r\n            content[\"header-running-right\"];\r\n    });\r\n    document.querySelectorAll(\".running-footer\").forEach((footerDiv) => {\r\n        footerDiv.querySelector(\".footer-left\").innerHTML =\r\n            content[\"footer-running-left\"];\r\n        footerDiv.querySelector(\".footer-center\").innerHTML =\r\n            content[\"footer-running-center\"];\r\n        footerDiv.querySelector(\".footer-right\").innerHTML =\r\n            content[\"footer-running-right\"];\r\n    });\r\n\r\n    // Persist edits to localStorage\r\n    const selectorMap = {\r\n        \"header-first-left\": \".first-page-header .header-left\",\r\n        \"header-first-center\": \".first-page-header .header-center\",\r\n        \"header-first-right\": \".first-page-header .header-right\",\r\n        \"footer-first-left\": \".first-page-footer .footer-left\",\r\n        \"footer-first-center\": \".first-page-footer .footer-center\",\r\n        \"footer-first-right\": \".first-page-footer .footer-right\",\r\n        \"header-running-left\": \".running-header .header-left\",\r\n        \"header-running-center\": \".running-header .header-center\",\r\n        \"header-running-right\": \".running-header .header-right\",\r\n        \"footer-running-left\": \".running-footer .footer-left\",\r\n        \"footer-running-center\": \".running-footer .footer-center\",\r\n        \"footer-running-right\": \".running-footer .footer-right\",\r\n    };\r\n    keys.forEach((key) => {\r\n        const elements = document.querySelectorAll(selectorMap[key]);\r\n        elements.forEach((elem) => {\r\n            elem.addEventListener(\"input\", () => {\r\n                localStorage.setItem(key, elem.innerHTML);\r\n            });\r\n        });\r\n    });\r\n}\r\n", "/**\r\n * Paper size detection.\r\n *\r\n * Determines paper size (letter vs a4) from localStorage, or falls back\r\n * to geographic detection via ipapi.co.\r\n */\r\n\r\nexport function getPaperSize() {\r\n    let paperSize = localStorage.getItem(\"papersize\");\r\n    if (paperSize) return paperSize;\r\n\r\n    // Try to set papersize based on user's geographic region\r\n    try {\r\n        fetch(\"https://ipapi.co/json/\")\r\n            .then((response) => response.json())\r\n            .then((data) => {\r\n                const continent =\r\n                    data && data.continent_code ? data.continent_code : \"\";\r\n                paperSize =\r\n                    continent === \"NA\" || continent === \"SA\"\r\n                        ? \"letter\"\r\n                        : \"a4\";\r\n                const radio = document.querySelector(\r\n                    `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n                );\r\n                if (radio) {\r\n                    radio.checked = true;\r\n                    localStorage.setItem(\"papersize\", paperSize);\r\n                }\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(paperSize);\r\n            })\r\n            .catch((err) => {\r\n                throw err;\r\n            });\r\n    } catch (e) {\r\n        const radio = document.querySelector(\r\n            'input[name=\"papersize\"][value=\"letter\"]'\r\n        );\r\n        if (radio) radio.checked = true;\r\n    }\r\n    return paperSize || \"letter\";\r\n}\r\n", "/**\r\n * Printout section loading (print preview).\r\n *\r\n * Swaps the current page content with the target printable section\r\n * and switches to the print-worksheet stylesheet.\r\n */\r\n\r\nexport async function loadPrintout(printableSectionID) {\r\n    const themeStylesheetLink = document.querySelector(\r\n        'link[rel=\"stylesheet\"][href*=\"theme\"]'\r\n    );\r\n    const themeStylesheetHref = themeStylesheetLink\r\n        ? themeStylesheetLink.getAttribute(\"href\")\r\n        : null;\r\n\r\n    if (themeStylesheetHref) {\r\n        const printStylesheetHref = themeStylesheetHref.replace(\r\n            /theme.*\\.css/,\r\n            \"print-worksheet.css\"\r\n        );\r\n        themeStylesheetLink.setAttribute(\"href\", printStylesheetHref);\r\n        await new Promise((resolve) => {\r\n            themeStylesheetLink.addEventListener(\"load\", resolve, {\r\n                once: true,\r\n            });\r\n        });\r\n    }\r\n\r\n    const printableSection = document.getElementById(printableSectionID);\r\n    if (!printableSection) {\r\n        console.error(\"No section found with ID:\", printableSectionID);\r\n        return;\r\n    }\r\n\r\n    const ptxContent = document.querySelector(\".ptx-content\");\r\n    const existingSections = ptxContent.querySelectorAll(\":scope > section\");\r\n    existingSections.forEach((sec) => ptxContent.removeChild(sec));\r\n    ptxContent.appendChild(printableSection);\r\n}\r\n", "/**\r\n * Solution rewriting for print preview.\r\n *\r\n * Converts <details>/<summary> solution elements into plain <div>s\r\n * with a heading, so they render properly in print layout.\r\n */\r\n\r\nexport function rewriteSolutions() {\r\n    const bornHiddenKnowls = document.querySelectorAll(\r\n        \".worksheet details, .handout details\"\r\n    );\r\n    bornHiddenKnowls.forEach(function (detail) {\r\n        const summary = detail.querySelector(\"summary\");\r\n        const content = detail.innerHTML.replace(summary.outerHTML, \"\");\r\n        const div = document.createElement(\"div\");\r\n        div.classList = detail.classList;\r\n        if (summary) {\r\n            const title = document.createElement(\"h5\");\r\n            title.innerHTML = summary.innerHTML;\r\n            div.appendChild(title);\r\n        }\r\n        const body = document.createElement(\"div\");\r\n        body.innerHTML = content;\r\n        div.appendChild(body);\r\n        detail.parentNode.replaceChild(div, detail);\r\n    });\r\n}\r\n", "/**\r\n * Print-preview initialization and controls.\r\n *\r\n * Orchestrates the print-preview workflow: loading the printout section,\r\n * setting up paper size controls, managing solution visibility, creating\r\n * or adjusting pages, and wiring up header/footer toggles.\r\n */\r\n\r\nimport { toPixels, setPageGeometryCSS } from \"./geometry.js\";\r\nimport {\r\n    adjustWorkspaceToFitPage,\r\n    toggleWorkspaceHighlight,\r\n} from \"./workspace.js\";\r\nimport {\r\n    flattenParagraphsSections,\r\n    waitForImages,\r\n    adjustPrintoutPages,\r\n    createPrintoutPages,\r\n} from \"./pages.js\";\r\nimport { addHeadersAndFootersToPrintout } from \"./headers-footers.js\";\r\nimport { getPaperSize } from \"./paper-size.js\";\r\nimport { loadPrintout } from \"./section-swap.js\";\r\nimport { rewriteSolutions } from \"./solutions.js\";\r\n\r\nexport async function initPrintPreview() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"printpreview\")) return;\r\n\r\n    const printableSectionID = urlParams.get(\"printpreview\");\r\n    await loadPrintout(printableSectionID);\r\n\r\n    // Parse margins\r\n    const marginList = document\r\n        .querySelector(\"section.worksheet, section.handout\")\r\n        .getAttribute(\"data-margins\")\r\n        .split(\" \");\r\n    const margins = {\r\n        top: toPixels(marginList[0] || \"0.75in\"),\r\n        right: toPixels(marginList[1] || \"0.75in\"),\r\n        bottom: toPixels(marginList[2] || \"0.75in\"),\r\n        left: toPixels(marginList[3] || \"0.75in\"),\r\n    };\r\n\r\n    rewriteSolutions();\r\n\r\n    // Paper size setup\r\n    let paperSize = getPaperSize();\r\n    if (paperSize) {\r\n        const radio = document.querySelector(\r\n            `input[name=\"papersize\"][value=\"${paperSize}\"]`\r\n        );\r\n        if (radio) radio.checked = true;\r\n        document.body.classList.remove(\"a4\", \"letter\");\r\n        document.body.classList.add(paperSize);\r\n        setPageGeometryCSS({ paperSize, margins });\r\n    }\r\n\r\n    // Paper size radio change handlers\r\n    const papersizeRadios = document.querySelectorAll(\r\n        'input[name=\"papersize\"]'\r\n    );\r\n    papersizeRadios.forEach((radio) => {\r\n        radio.addEventListener(\"change\", function () {\r\n            if (this.checked) {\r\n                document.body.classList.remove(\"a4\", \"letter\");\r\n                document.body.classList.add(this.value);\r\n                localStorage.setItem(\"papersize\", this.value);\r\n                setPageGeometryCSS({ paperSize: this.value, margins });\r\n                adjustWorkspaceToFitPage({\r\n                    paperSize: this.value,\r\n                    margins,\r\n                });\r\n            }\r\n        });\r\n    });\r\n\r\n    // Solution visibility checkboxes\r\n    for (const solutionType of [\"hint\", \"answer\", \"solution\"]) {\r\n        const checkbox = document.getElementById(\r\n            `hide-${solutionType}-checkbox`\r\n        );\r\n        if (!checkbox) continue;\r\n\r\n        const storageKey = `hide-${solutionType}`;\r\n        if (\r\n            (solutionType === \"answer\" || solutionType === \"solution\") &&\r\n            !localStorage.getItem(storageKey)\r\n        ) {\r\n            checkbox.checked = true;\r\n            localStorage.setItem(storageKey, \"true\");\r\n        }\r\n\r\n        checkbox.checked = localStorage.getItem(storageKey) === \"true\";\r\n        document.querySelectorAll(`div.${solutionType}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.add(\"hidden\");\r\n            } else {\r\n                elem.classList.remove(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(storageKey, this.checked);\r\n            document\r\n                .querySelectorAll(`div.${solutionType}`)\r\n                .forEach((elem) => {\r\n                    if (checkbox.checked) {\r\n                        elem.classList.add(\"hidden\");\r\n                    } else {\r\n                        elem.classList.remove(\"hidden\");\r\n                    }\r\n                    adjustWorkspaceToFitPage({ paperSize, margins });\r\n                });\r\n        });\r\n    }\r\n\r\n    // Build pages\r\n    const printoutSection = document.querySelector(\r\n        \"section.worksheet, section.handout\"\r\n    );\r\n    if (printoutSection) {\r\n        flattenParagraphsSections(printoutSection);\r\n        await waitForImages(printoutSection);\r\n    }\r\n\r\n    if (document.querySelector(\".onepage\")) {\r\n        adjustPrintoutPages();\r\n    } else {\r\n        createPrintoutPages(margins);\r\n    }\r\n\r\n    addHeadersAndFootersToPrintout();\r\n\r\n    // Header/footer toggle checkboxes\r\n    for (const hf of [\r\n        \"first-page-header\",\r\n        \"running-header\",\r\n        \"first-page-footer\",\r\n        \"running-footer\",\r\n    ]) {\r\n        const checkbox = document.getElementById(`print-${hf}-checkbox`);\r\n        if (!checkbox) continue;\r\n\r\n        checkbox.checked =\r\n            localStorage.getItem(`print-${hf}`) === \"true\";\r\n        document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n            if (checkbox.checked) {\r\n                elem.classList.remove(\"hidden\");\r\n            } else {\r\n                elem.classList.add(\"hidden\");\r\n            }\r\n        });\r\n\r\n        checkbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(`print-${hf}`, this.checked);\r\n            document.querySelectorAll(`.${hf}`).forEach((elem) => {\r\n                if (checkbox.checked) {\r\n                    elem.classList.remove(\"hidden\");\r\n                } else {\r\n                    elem.classList.add(\"hidden\");\r\n                }\r\n                adjustWorkspaceToFitPage({ paperSize, margins });\r\n            });\r\n        });\r\n    }\r\n\r\n    // Adjust workspace heights\r\n    adjustWorkspaceToFitPage({ paperSize, margins });\r\n\r\n    // Highlight workspace checkbox\r\n    const highlightCheckbox = document.getElementById(\r\n        \"highlight-workspace-checkbox\"\r\n    );\r\n    if (highlightCheckbox) {\r\n        highlightCheckbox.checked =\r\n            localStorage.getItem(\"highlightWorkspace\") === \"true\";\r\n        highlightCheckbox.addEventListener(\"change\", function () {\r\n            localStorage.setItem(\"highlightWorkspace\", this.checked);\r\n            toggleWorkspaceHighlight(this.checked);\r\n        });\r\n        toggleWorkspaceHighlight(highlightCheckbox.checked);\r\n    }\r\n}\r\n", "/**\r\n * Dark/light mode switching.\r\n *\r\n * Detects user preference via localStorage or `prefers-color-scheme`,\r\n * toggles the `dark-mode` class on `<html>` and syncs to embedded iframes.\r\n */\r\n\r\nexport function isDarkMode() {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return false;\r\n\r\n    const currentTheme = localStorage.getItem(\"theme\");\r\n    if (currentTheme === \"dark\") return true;\r\n    if (currentTheme === \"light\") return false;\r\n\r\n    return (\r\n        window.matchMedia &&\r\n        window.matchMedia(\"(prefers-color-scheme: dark)\").matches\r\n    );\r\n}\r\n\r\nexport function setDarkMode(isDark) {\r\n    if (document.documentElement.dataset.darkmode === \"disabled\") return;\r\n\r\n    const parentHtml = document.documentElement;\r\n    const iframes = document.querySelectorAll(\r\n        \"iframe[data-dark-mode-enabled]\"\r\n    );\r\n\r\n    if (isDark) {\r\n        parentHtml.classList.add(\"dark-mode\");\r\n    } else {\r\n        parentHtml.classList.remove(\"dark-mode\");\r\n    }\r\n\r\n    // Sync each iframe's <html> class with the parent\r\n    for (const iframe of iframes) {\r\n        try {\r\n            const iframeHtml = iframe.contentWindow.document.documentElement;\r\n            if (isDark) {\r\n                iframeHtml.classList.add(\"dark-mode\");\r\n            } else {\r\n                iframeHtml.classList.remove(\"dark-mode\");\r\n            }\r\n        } catch (err) {\r\n            console.warn(\"Dark mode sync to iframe failed:\", err);\r\n        }\r\n    }\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.querySelector(\".icon\").innerText = isDark\r\n            ? \"light_mode\"\r\n            : \"dark_mode\";\r\n        modeButton.querySelector(\".name\").innerText = isDark\r\n            ? \"Light Mode\"\r\n            : \"Dark Mode\";\r\n    }\r\n}\r\n\r\nexport function initThemeToggle() {\r\n    // Run immediately to avoid flicker\r\n    setDarkMode(isDarkMode());\r\n\r\n    // Wire up button after DOM is ready (called from entry point's DOMContentLoaded)\r\n    const isDark = isDarkMode();\r\n    setDarkMode(isDark);\r\n\r\n    const modeButton = document.getElementById(\"light-dark-button\");\r\n    if (modeButton) {\r\n        modeButton.addEventListener(\"click\", function () {\r\n            const wasDark = isDarkMode();\r\n            setDarkMode(!wasDark);\r\n            localStorage.setItem(\"theme\", wasDark ? \"light\" : \"dark\");\r\n        });\r\n    }\r\n}\r\n", "/**\r\n * Embed/share button and embed-mode display.\r\n *\r\n * Provides the \"embed in LMS\" button that copies an <iframe> snippet,\r\n * and strips chrome when the page is loaded in embed mode (?embed).\r\n */\r\n\r\nimport { setDarkMode } from \"./theme.js\";\r\n\r\nexport function initShareButton() {\r\n    const shareButton = document.getElementById(\"embed-button\");\r\n    if (!shareButton) return;\r\n\r\n    const sharePopup = document.getElementById(\"embed-popup\");\r\n    const embedCode =\r\n        \"<iframe src='\" +\r\n        window.location.href +\r\n        \"?embed' width='100%' height='1000px' frameborder='0'></iframe>\";\r\n    const embedTextbox = document.getElementById(\"embed-code-textbox\");\r\n    if (embedTextbox) {\r\n        embedTextbox.value = embedCode;\r\n    }\r\n\r\n    shareButton.addEventListener(\"click\", function () {\r\n        sharePopup.classList.toggle(\"hidden\");\r\n    });\r\n\r\n    const copyButton = document.getElementById(\"copy-embed-button\");\r\n    if (copyButton) {\r\n        copyButton.addEventListener(\"click\", function () {\r\n            const textbox = document.getElementById(\"embed-code-textbox\");\r\n            if (textbox) {\r\n                navigator.clipboard\r\n                    .writeText(embedCode)\r\n                    .then(() => {\r\n                        console.log(\"Embed code copied to clipboard!\");\r\n                    })\r\n                    .catch((err) => {\r\n                        console.error(\"Failed to copy embed code: \", err);\r\n                    });\r\n                copyButton.querySelector(\".icon\").innerText =\r\n                    \"library_add_check\";\r\n                setTimeout(function () {\r\n                    copyButton.querySelector(\".icon\").innerText =\r\n                        \"content_copy\";\r\n                    sharePopup.classList.add(\"hidden\");\r\n                }, 450);\r\n            }\r\n        });\r\n    }\r\n}\r\n\r\nexport function initEmbedMode() {\r\n    const urlParams = new URLSearchParams(window.location.search);\r\n    if (!urlParams.has(\"embed\")) return;\r\n\r\n    // Set dark mode based on value of param\r\n    if (urlParams.get(\"embed\") === \"dark\") {\r\n        setDarkMode(true);\r\n    } else {\r\n        setDarkMode(false);\r\n    }\r\n\r\n    const elemsToHide = [\r\n        \"ptx-navbar\",\r\n        \"ptx-masthead\",\r\n        \"ptx-page-footer\",\r\n        \"ptx-sidebar\",\r\n        \"ptx-content-footer\",\r\n    ];\r\n    for (const id of elemsToHide) {\r\n        const elem = document.getElementById(id);\r\n        if (elem) {\r\n            elem.classList.add(\"hidden\");\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Code block copy-to-clipboard button.\r\n *\r\n * Wraps `.clipboardable` elements with a container and injects a copy\r\n * button.  Clicking the button copies the `<pre>` content.\r\n */\r\n\r\nexport function initCodeCopyButtons() {\r\n    const elements = document.querySelectorAll(\".clipboardable\");\r\n    for (const el of elements) {\r\n        const div = document.createElement(\"div\");\r\n        div.classList.add(\"clipboardable\");\r\n        el.classList.remove(\"clipboardable\");\r\n        el.replaceWith(div);\r\n        div.insertAdjacentElement(\"afterbegin\", el);\r\n        div.insertAdjacentHTML(\r\n            \"beforeend\",\r\n            `\r\n    <button class=\"code-copy\" title=\"Copy code\" role=\"button\" aria-label=\"Copy code\" >\r\n        <span class=\"copyicon material-symbols-outlined\">content_copy</span>\r\n        <span class=\"checkmark material-symbols-outlined\">check</span>\r\n    </button>\r\n            `.trim()\r\n        );\r\n    }\r\n}\r\n\r\nexport function initCodeCopyHandler() {\r\n    document.addEventListener(\"click\", (ev) => {\r\n        const codeBox = ev.target.closest(\".clipboardable\");\r\n        if (!navigator.clipboard || !codeBox) return;\r\n        const button = ev.target.closest(\".code-copy\");\r\n        if (!button) return;\r\n        const preContent = codeBox.querySelector(\"pre\").textContent;\r\n        navigator.clipboard.writeText(preContent);\r\n        button.classList.toggle(\"copied\");\r\n        setTimeout(() => button.classList.toggle(\"copied\"), 1000);\r\n    });\r\n}\r\n", "/**\r\n * Auto-ID generation for paragraphs without IDs.\r\n *\r\n * \u26A0\uFE0F DEPRECATED / SUSPICIOUS: Generates IDs like \"base-id-part2\", \"base-id-part3\"\r\n * for <p> elements that lack an id, based on the nearest preceding <p> that has one.\r\n * Produces heavy console.log output. It is unclear whether any downstream code\r\n * depends on the generated IDs.\r\n */\r\n\r\nexport function initAutoId() {\r\n    const noIdParagraphs = document.querySelectorAll(\".main p:not([id])\");\r\n    for (let n = noIdParagraphs.length - 1; n >= 0; --n) {\r\n        const e = noIdParagraphs[n];\r\n        if (e.hasAttribute(\"id\")) continue;\r\n        if (e.classList.contains(\"watermark\")) continue;\r\n\r\n        // Find all preceding sibling <p> elements\r\n        const prevParagraphs = [];\r\n        let sibling = e.previousElementSibling;\r\n        while (sibling) {\r\n            if (sibling.tagName === \"P\") {\r\n                prevParagraphs.push(sibling);\r\n            }\r\n            sibling = sibling.previousElementSibling;\r\n        }\r\n\r\n        if (prevParagraphs.length === 0) continue;\r\n\r\n        let partsFound = 1;\r\n        const partsToId = [e];\r\n        for (let i = 0; i < prevParagraphs.length; ++i) {\r\n            const thisPrevious = prevParagraphs[i];\r\n            if (!thisPrevious.hasAttribute(\"id\")) {\r\n                partsToId.unshift(thisPrevious);\r\n            } else {\r\n                const baseId = thisPrevious.id;\r\n                for (let j = 0; j < partsToId.length; ++j) {\r\n                    ++partsFound;\r\n                    const nextId = baseId + \"-part\" + partsFound.toString();\r\n                    partsToId[j].setAttribute(\"id\", nextId);\r\n                }\r\n                break;\r\n            }\r\n        }\r\n    }\r\n}\r\n", "/**\r\n * Video magnification (resize YouTube iframes to full browser width).\r\n *\r\n * \u26A0\uFE0F DEAD CODE: The selector `body iframeXXXX` intentionally matches no\r\n * elements.  This module is preserved for reference but has no effect.\r\n */\r\n\r\nexport function initVideoMagnify() {\r\n    const allIframes = document.querySelectorAll(\"body iframeXXXX\");\r\n    for (let i = 0; i < allIframes.length; i++) {\r\n        const thisItem = allIframes[i];\r\n        const thisItemSrc = thisItem.src;\r\n        if (!thisItemSrc.includes(\"youtube\")) continue;\r\n\r\n        const thisItemId = thisItem.id;\r\n        const thisItemWidth = thisItem.width;\r\n        const thisItemHeight = thisItem.height;\r\n        if (thisItemHeight < 150) continue;\r\n\r\n        const emptyDiv = document.createElement(\"div\");\r\n        const videomagContainer = document.createElement(\"div\");\r\n        const parentTag = thisItem.parentElement.tagName;\r\n        if (parentTag === \"FIGURE\") {\r\n            videomagContainer.setAttribute(\"class\", \"videobig\");\r\n        } else {\r\n            videomagContainer.setAttribute(\"class\", \"videobig nofigure\");\r\n        }\r\n        videomagContainer.setAttribute(\"video-id\", thisItemId);\r\n        videomagContainer.setAttribute(\"data-width\", thisItemWidth);\r\n        videomagContainer.setAttribute(\"data-height\", thisItemHeight);\r\n        videomagContainer.innerHTML = \"fit width\";\r\n\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", videomagContainer);\r\n        thisItem.insertAdjacentElement(\"beforebegin\", emptyDiv);\r\n    }\r\n\r\n    // Toggle handlers\r\n    document.body.addEventListener(\"click\", function (event) {\r\n        const bigBtn = event.target.closest(\".videobig\");\r\n        if (bigBtn) {\r\n            const videoId = bigBtn.getAttribute(\"video-id\");\r\n            const video = document.getElementById(videoId);\r\n            const originalWidth = parseInt(bigBtn.getAttribute(\"data-width\"));\r\n            const originalHeight = parseInt(bigBtn.getAttribute(\"data-height\"));\r\n            const browserWidth = window.innerWidth;\r\n            const widthRatio = browserWidth / originalWidth;\r\n\r\n            video.setAttribute(\"width\", widthRatio * originalWidth);\r\n            video.setAttribute(\"height\", widthRatio * originalHeight);\r\n            video.setAttribute(\r\n                \"style\",\r\n                \"position:relative; 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   "names": ["event", "tempContainer", "event", "event", "event", "event", "event", "workspaces", "totalHeight", "nextChild", "content", "content", "event"]
 }
diff --git a/js/src/knowl.js b/js/src/knowl.js
index 42e9d3fdf..9723a351a 100644
--- a/js/src/knowl.js
+++ b/js/src/knowl.js
@@ -326,6 +326,7 @@ export function addKnowls(target) {
     const bornHiddens = target.querySelectorAll(".born-hidden-knowl");
     for (const bhk of bornHiddens) {
         const summary = bhk.querySelector(":scope > summary");
+        if (!summary) continue;
         const contents = bhk.querySelector(":scope > summary + *");
         new SlideRevealer(summary, contents, bhk);
     }