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perf(BaseStyles): Remove expensive :has([data-color-mode]) selectors #7325

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perf(BaseStyles): Remove expensive :has([data-color-mode]) selectors #7325

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perf(BaseStyles): Remove expensive :has([data-color-mode]) selectors
mattcosta7 Dec 15, 2025
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Merge branch 'main' into perf/basestyles-has-selector
mattcosta7 Dec 16, 2025
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8 changes: 8 additions & 0 deletions .changeset/perf-basestyles-has-selector.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
---
'@primer/react': patch
---

perf(BaseStyles): Remove expensive :has([data-color-mode]) selectors

Remove `:has([data-color-mode])` selectors that scanned the entire DOM on every style recalculation.
Input color-scheme is already handled by global selectors in the codebase.
19 changes: 6 additions & 13 deletions packages/react/src/BaseStyles.module.css
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Expand Up @@ -60,19 +60,12 @@ details-dialog:focus:not(:focus-visible):not(:global(.focus-visible)) {
/* stylelint-disable-next-line primer/colors */
color: var(--BaseStyles-fgColor, var(--fgColor-default));

/* Global styles for light mode */
&:has([data-color-mode='light']) {
input & {
color-scheme: light;
}
}

/* Global styles for dark mode */
&:has([data-color-mode='dark']) {
input & {
color-scheme: dark;
}
}
/*
* PERFORMANCE: Removed :has([data-color-mode]) selectors that scanned entire DOM.
* Input color-scheme is already handled by global selectors above:
* [data-color-mode='light'] input { color-scheme: light; }
* [data-color-mode='dark'] input { color-scheme: dark; }
*/

/* Low-specificity default link styling */
:where(a:not([class*='prc-']):not([class*='PRC-']):not([class*='Primer_Brand__'])) {
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