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Limited Availability Anchor positioning

Anchor positioning animations and transitions

The anchor() and anchor-size() CSS functions animate or transition on changes such as the anchor box moving or the anchor element changing.
Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Sep 15, 2025.
Desktop Browser Engine Support
Google Chrome
125
Supported
Mozilla Firefox
—
Unsupported
Apple Safari
26
Supported
Microsoft Edge
125
Supported
Mobile Browser Engine Support
Chrome Android
125
Firefox Android
—
Safari iOS
26
Specifications and References
Specification ↗ Feature XML ↗
MDN Browser Compat Data Keys:
css.types.anchor-size.is_animatable ↗ css.types.anchor.is_animatable ↗
id: anchor-positioning-animations