Redo z-index execution#42607
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coliff
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Jul 4, 2026
| <Callout> | ||
| ### Low-level stack | ||
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| We call these “low-level” `z-index` utilities because of their default values of `-1` through `3`, which we use for the layout of overlapping components. High-level `z-index` values are used for overlay components like modals and tooltips. |
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"like modals and tooltips" should be: "like dialogs and tooltips"
- Move to a combined Sass map - Generate tokens on the root for all values - Update components to use CSS variables instead
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Make all z-index part of the same scale. This is an old branch I found that never got opened for review. It's a maybe for me, but curious @julien-deramond and @coliff thoughts.
Alternative here would be to have a utility-focused z-index scale (like the current
$zindex-levelsmap) and a separate$zindex-component-levelsfor those values. I could see something like this being better for customizing so you don't blow away the component levels by adding a new utility level.