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Firefox 150 adds CSS namespaced attributes behind pref#29482

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dletorey wants to merge 15 commits intomdn:mainfrom
dletorey:43556-namespaced-attributes-in-attr
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Firefox 150 adds CSS namespaced attributes behind pref#29482
dletorey wants to merge 15 commits intomdn:mainfrom
dletorey:43556-namespaced-attributes-in-attr

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@dletorey dletorey commented Apr 14, 2026 •
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Summary

  • Added <attr-name> accepts namespaces
  • Added impl_url for Chrome & Safari

Test results and supporting details

Tested using these WPTs:

Passes With flag set layout.css.attr.enabled
  • Firefox Beta 150
  • Firefox Developer Edition 150
  • Firefox Nightly 151
Fails
  • Firefox 149
  • Chrome Canary 148
  • Chrome Developer 148
  • Chrome Beta 147
  • Edge Canary 148
  • Edge Dev 148
  • Edge Beta 147
  • Opera Developer 147
  • Safari Technology Preview 240
  • Safari 26.4

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@github-actions github-actions bot added data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS size:m [PR only] 25-100 LoC changed labels Apr 14, 2026
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github-actions bot commented Apr 14, 2026 •
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Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

This was referenced Apr 14, 2026
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@dletorey dletorey mentioned this pull request Apr 14, 2026
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caugner commented Apr 17, 2026

  • Added accepts <image> for light-dark() color function

This looks like a summary belonging to another PR?

caugner
caugner requested changes Apr 17, 2026
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Comment thread css/types/attr.json Outdated
Comment thread css/types/attr.json Outdated
Comment thread css/types/attr.json Outdated
Comment thread css/types/attr.json Outdated
Comment thread css/types/attr.json Outdated
@caugner caugner changed the title added data for namespaced attributes in attr Firefox 150 adds CSS namespaced attributes behind pref Apr 17, 2026
@dletorey dletorey requested a review from caugner April 20, 2026 12:14
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@caugner caugner Awaiting requested review from caugner

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data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS size:m [PR only] 25-100 LoC changed

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@dletorey @caugner @mdn-bot