Firefox 147 ships CSS Anchor Positioning#28649
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caugner
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Dec 12, 2025
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As far as I can see, this PR contains two related but separate changes:
- Consolidate
position-tryproperties data:
- css/properties/position-try-fallbacks.json
- css/properties/position-try.json
- Firefox 147 ships CSS Anchor Positioning
- css/at-rules/position-try.json
- css/properties/position-visibility.json
- css/types/anchor-size.json
- css/types/anchor.json
@chrisdavidmills Could you please extract the consolidation into a separate PR? 🙏
caugner
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Dec 12, 2025
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Yes. See #28652 for the consolidation PR. |
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Summary
Firefox 147 enables CSS anchor positioning by default. See https://bugzilla.mozilla.org/show_bug.cgi?id=1988225.
Most of the necessary data updates were handled by the most recent collector PR: #28624 (hat tip: @Elchi3).
This PR builds on that, adding a few bits that the collector didn't uncover.
Test results and supporting details
Related issues