Intent to Prototype & Ship: `position-anchor: normal`

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David Shin

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Apr 10, 2026, 1:14:34 PMApr 10

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Summary:

`position-anchor: normal` allows authors to use anchor positioning without having to specify an explicit anchor for popovers and pseudo-elements, in a back-compatible manner.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=2030351

Specification: https://drafts.csswg.org/css-anchor-position-1/#valdef-position-anchor-normal

Standards Body: CSSWG

Platform Coverage: All

Preference: layout.css.anchor-positioning.enabled (Already on)

DevTools Bug: N/A

Extensions Bug: N/A

Use Counter: N/A (Extension to already shipped feature)

Standards-Positions Discussion: https://github.com/mozilla/standards-positions/issues/794

Other Browsers:
- Blink: https://issues.chromium.org/issues/501399489
- WebKit: https://bugs.webkit.org/show_bug.cgi?id=311941

web-platform-tests: Being modified/added as part of the bug:

/css/css-anchor-position/position-anchor-basics.html
/css/css-anchor-position/position-anchor-normal.html

Bug to turn on by default: N/A, extension to already prefed-on property

Standard: https://drafts.csswg.org/css-anchor-position-1/#valdef-position-anchor-normal