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Firefox Nightly enabled Anchor Positioning#28272

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caugner merged 3 commits intomdn:mainfrom
bsmth:41510-anchor-positioning
Oct 24, 2025
Merged

Firefox Nightly enabled Anchor Positioning#28272
caugner merged 3 commits intomdn:mainfrom
bsmth:41510-anchor-positioning

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@bsmth bsmth commented Oct 23, 2025

Description

The pref layout.css.anchor-positioning.enabled gating CSS anchor positioning features is true by default in Nightly.

Changes:

  • Everything tagged web-features:anchor-positioning flipped to preview
  • Everything with "impl_url": "https://bugzil.la/1838746" flipped to preview

Additions:

  • Adding "web-features:anchor-positioning" to features that look like they're missing it

Additional details

I ran the collector against Nightly and it seems to agree with everything except for position-try-order. Engineering indicate it's not implemented, so leaving as false.

Related issues and pull requests

@github-actions github-actions bot added data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS data:html Compat data for HTML elements. https://developer.mozilla.org/docs/Web/HTML size:xl [PR only] >1000 LoC changed labels Oct 23, 2025
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github-actions bot commented Oct 23, 2025

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

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bsmth commented Oct 23, 2025

Other comments:

Incorporated in c871577

@bsmth bsmth marked this pull request as ready for review October 23, 2025 14:55
chrisdavidmills added a commit to chrisdavidmills/browser-compat-data that referenced this pull request Oct 24, 2025
@caugner caugner changed the title Firefox enables anchor positioning pref by default in Nightly Firefox Nightly enabled Anchor Positioning Oct 24, 2025
"version_added": "preview",
"impl_url": [
"https://bugzil.la/1838746",
"https://bugzil.la/1924090"
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Nit: This might be justification for partial_implementation or a behavioral subfeature.?

@caugner caugner merged commit 341db28 into mdn:main Oct 24, 2025
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data:api Compat data for Web APIs. https://developer.mozilla.org/docs/Web/API data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS data:html Compat data for HTML elements. https://developer.mozilla.org/docs/Web/HTML size:xl [PR only] >1000 LoC changed

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2 participants