Cross-Browser Anchor Positioning

Anchor Positioning is available in all browsers. What’s next, with Eric Meyer.

on Winging It episode 26 with James & Miriam on November 20, 2025 | 60 min

It’s finally here! With the release of Firefox 145, CSS anchor positioning is available in all browsers. It’s still behind a flag in Firefox, so it isn’t Baseline Newly available quite yet. Join James Stuckey Weber, Miriam Suzanne, and Eric Meyer of Igalia as they talk about the emerging patterns, the rough edges and changes to the spec, and what the future holds for anchor positioning.

Check out our Anchor Positioning Playlist to learn how to use and troubleshoot Anchor Positioning today.

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What We Cover:

The state of Anchor Positioning now

Everywhere but Firefox, and Firefox is behind a flag
- Go to about:config and enable layout.css.anchor-positioning.enabled
Perhaps will be released December 9, with Firefox 146

What rough edges are being ironed out?

Position fallback: when should it fallback?
Containing block shift overflow difference
Popover default margin styles

What are the emerging patterns?

Follower pattern by anchoring on a pseudo class
Floating focus (but is it accessible, or good UX?)
--is, --for pattern

Known issues

Anchor containers (like position containers) are not always where you assume they’ll be
Scrolling can only respond to default anchor element scrolling
Position area not working as expected, and the syntax is complex.
Bugs (but they’re being fixed pretty quickly)

Will Anchor Positioning be baseline?

What would it mean to be baseline?
Could some parts of anchor positioning be baseline?

What is coming next for Anchor Positioning?

Container queries for detecting fallback
Transforms

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