This bug tracks implementation of CSS Anchor Positioning Level 1.

Spec link: https://drafts.csswg.org/css-anchor-position-1/

xiaochengh has an explainer at https://xiaochengh.github.io/Explainers/css-anchor-position/explainer.html , FWIW.

Standards-position issue: https://github.com/mozilla/standards-positions/issues/794

Intent to Prototype e-mail:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/4cbytMKbHtg

I see that this meta bug depends on a ticket about adding basic support in block layout, explicit excluding support in other layouts like flex and grid.
What is the plan for those other layouts ? Will the feature ship without support for them ? If yes, this will make feature detection harder in case the relevant support is for anchor positioning in a grid layout.

Those separations are just to provide some stepping stones to break up the implementation work into digestable parts. There's no intention to release those parts separately, and usable feature detection is something we'll very much be keeping in mind. If/when we get to the point that we're going to release something that will be noted here, whether or not it's a "complete" or partial release.

I noticed the spec specifically mentioned that transform and other post-layout effects will not affect the position of the anchors. Is there any plans to address this?

I noticed the spec specifically mentioned that transform and other post-layout effects will not affect the position of the anchors. Is there any plans to address this?

See this CSSWG issue: https://github.com/w3c/csswg-drafts/issues/8584 — if you have any specific use cases you're thinking about, please, comment in the issue, it will help with moving it forward!