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Update Firefox data for appearance: base-select#29780

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KirtiRamchandani wants to merge 1 commit into
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KirtiRamchandani:data/appearance-base-select-firefox149
Open

Update Firefox data for appearance: base-select#29780
KirtiRamchandani wants to merge 1 commit into
mdn:mainfrom
KirtiRamchandani:data/appearance-base-select-firefox149

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Summary

Update Firefox compatibility data for appearance: base-select and the single-dropdown customizable select subfeature.

Details

Firefox bug 1974787 was fixed for Firefox 149 and added appearance: base-select behind layout.css.appearance-base-select.enabled. This updates the general base-select value and the single-dropdown subfeature with the corresponding preference flag.

I left the listbox and multiple-dropdown subfeatures unchanged because the Firefox bug documents the customizable <select> value, but does not establish those separate subfeatures.

Tests

  • npm run lint -- css/properties/appearance.json
  • prettier --check css/properties/appearance.json
  • node -e "JSON.parse(require('fs').readFileSync('css/properties/appearance.json','utf8')); console.log('valid json')"
  • git diff --check

Related

@github-actions github-actions Bot added data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS size:s [PR only] 7-24 LoC changed labels Jun 1, 2026
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github-actions Bot commented Jun 1, 2026

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Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

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data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS size:s [PR only] 7-24 LoC changed

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