diff --git a/Makefile.am b/Makefile.am
index 3da4d65..ddd401b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -85,6 +85,8 @@ sile/readme_%.sil: sile/README.md $(CODEBLOCK_FILTER)
 
 TYPSTASSETS = typst/decasify.wasm typst/readme_1.svg typst/readme_2.svg typst/LICENSE
 
+TYPST_EXPECTATIONS = tests/styled.html
+
 .PHONY: typst-universe
 typst-universe: $(TYPSTASSETS)
 
@@ -111,8 +113,13 @@ typst/decasify.wasm: typst/src/lib.rs
 	$(TYPST) compile -f svg $< $@
 	$(SVGO) --multipass --precision 2 --pretty --indent 2 $@
 
+%.html: %.typ typst-universe
+	$(TYPST) compile --root $(top_srcdir) --features html --format html $<
+
 SILEASSETS = sile/readme_1.svg sile/readme_2.svg
 
+SILE_EXPECTATIONS = tests/styled.txt
+
 .PHONY: sile-docs
 sile-docs: $(SILEASSETS)
 
@@ -122,16 +129,24 @@ sile-docs: $(SILEASSETS)
 %.pdf: %.sil
 	cp $< target/
 	cd target
-	$(SILE) $(<F) -o ../$@
+	$(SILE) -o ../$@ $(<F)
 
 %.svg: %.pdf
 	$(PDF2SVG) $< $@
 	$(SVGO) --multipass --precision 2 --pretty --indent 2 $@
 	$(SED) -i -e '/\/defs/a   <rect width="100%" height="100%" fill="white" />' $@
 
-check: busted pytest
+%.txt: %.sil sile-docs
+	cp $< target/
+	cd target
+	$(SILE) -b debug -o ../$@ $(<F)
+	$(SILE) $(<F)
 
-PHONY_DEVELOPER_TARGETS = rockspecs srcrocks rocks install-luarock busted pytest release-preview
+TESTS = tests/style.html
+
+check: busted pytest sile-test typst-test
+
+PHONY_DEVELOPER_TARGETS = rockspecs srcrocks rocks install-luarock busted pytest sile-test typst-test release-preview
 .PHONY: $(PHONY_DEVELOPER_TARGETS)
 
 if DEVELOPER_MODE
@@ -172,6 +187,12 @@ pytest:
 	$(MATURIN) develop
 	env PYTHONPATH=.venv/lib/python3.12/site-packages/decasify $(PYTEST)
 
+sile-test: $(SILE_EXPECTATIONS)
+	$(GIT) diff-files --quiet -- $^
+
+typst-test: $(TYPST_EXPECTATIONS)
+	$(GIT) diff-files --quiet -- $^
+
 define rockpec_template =
 	$(SED) -e "s/@""PACKAGE_NAME""@/$(PACKAGE_NAME)/g" \
 		-e "s/@""SEMVER""@/$(SEMVER)/g" \
diff --git a/tests/styled.html b/tests/styled.html
new file mode 100644
index 0000000..3e8aed7
--- /dev/null
+++ b/tests/styled.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+  </head>
+  <body>
+    <table>
+      <tr>
+        <td>Source</td>
+        <td>this sample <strong>has bold</strong> and <em>italic underlined</em> bits.</td>
+      </tr>
+    </table>
+    <h2>Sentencecase</h2>
+    <table>
+      <tr>
+        <td>Actual</td>
+        <td>This sample <strong>has bold</strong> and <em>italic underlined</em> bits.</td>
+      </tr>
+      <tr>
+        <td>Expected</td>
+        <td>This sample <strong>has bold</strong> and <em>italic underlined</em> bits.</td>
+      </tr>
+    </table>
+    <h2>Titlecase</h2>
+    <table>
+      <tr>
+        <td>Actual</td>
+        <td>This Sample <strong>Has Bold</strong> and <em>Italic Underlined</em> Bits.</td>
+      </tr>
+      <tr>
+        <td>Expected</td>
+        <td>This Sample <strong>Has Bold</strong> and <em>Italic Underlined</em> Bits.</td>
+      </tr>
+    </table>
+  </body>
+</html>
diff --git a/tests/styled.sil b/tests/styled.sil
new file mode 100644
index 0000000..b5c5047
--- /dev/null
+++ b/tests/styled.sil
@@ -0,0 +1,18 @@
+\begin{document}
+\nofolios
+\neverindent
+\language[main=en]
+\use[module=packages.rules]
+\use[module=packages.decasify]
+\define[command=sample]{this sample \strong{has bold} and \em{italic \underline{underlined}} bits.}
+\define[command=group]{\bigskip\font[size=16pt,weight=800]{\process}\par}
+
+\sample
+
+\group{Sentencecase}
+\decasify[case=sentence]{this sample \strong{has bold} and \em{italic \underline{underlined}} bits.}
+
+\group{Titlecase}
+\decasify[case=title]{this sample \strong{has bold} and \em{italic \underline{underlined}} bits.}
+
+\end{document}
diff --git a/tests/styled.typ b/tests/styled.typ
new file mode 100644
index 0000000..1780347
--- /dev/null
+++ b/tests/styled.typ
@@ -0,0 +1,23 @@
+#import "../typst/decasify.typ": sentencecase, titlecase
+
+#set text(lang: "en")
+
+#let sample = [this sample *has bold* and _italic #underline[underlined]_ bits.]
+
+#table(columns: (2cm, 9cm))[Source][#sample]
+
+= Sentencecase
+
+#table(columns: (2cm, 9cm))[Actual][
+  #sentencecase[#sample]
+][Expected][
+  This sample *has bold* and _italic #underline[underlined]_ bits.
+]
+
+= Titlecase
+
+#table(columns: (2cm, 9cm))[Actual][
+  #titlecase[#sample]
+][Expected][
+  This Sample *Has Bold* and _Italic #underline[Underlined]_ Bits.
+]

Actual	This sample has bold and italic underlined bits.
Expected	This sample has bold and italic underlined bits.