[csswg-drafts] [css-anchor-position] Make `position-area` discretely animatable, for now. (#13577)

bramus has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-anchor-position] Make `position-area` discretely animatable, for now. ==
The spec currently defines the animation type of [`position-area`](https://drafts.csswg.org/css-anchor-position-1/#position-area) as:

> TBD

This is leading to inconsistencies across browsers right now:

- Safari and Chrome: the property animates discretely
- Firefox: the property does not animate

Still allowing a possible future custom description for how it _should_ animate (the `magic` in https://github.com/w3c/csswg-drafts/issues/9598#issuecomment-1981443500 for L2 of the spec), I think we should define it as discretely animatable until then.

This would remove the cross-browser inconsistency and also unlock animating from one `position-area` to another using View Transitions with a [`StyleObserver`](https://brm.us/style-observer), as shown in this demo _(which currently doesn’t work in Firefox)_: https://codepen.io/bramus/full/myrJYQz/b6aace5cc714e3147f81a2a1b4ed10f4

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13577 using your GitHub account


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Received on Sunday, 1 March 2026 14:58:00 UTC