Bug 300823

Summary:	[css-anchor-position-1] Disable auto margins in combination with position-area
Product:	WebKit	Reporter:	fantasai <fantasai.bugs>
Component:	Layout and Rendering	Assignee:	fantasai <fantasai.bugs>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Local Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:
Bug Blocks:	291856

fantasai

Reported 2025-10-15 12:13:58 PDT

Because the default UA styles for popover use `margin: auto; inset: 0`, making popovers integrate usefully with `position-area` requires disabling those margins. The current proposal for doing this is to disable `auto` margins when `position-area` is not `none`. See https://github.com/w3c/csswg-drafts/issues/10258#issuecomment-3374397145

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fantasai

Comment 1 2025-10-15 14:38:47 PDT

Pull request: https://github.com/WebKit/WebKit/pull/52419

EWS

Comment 2 2025-10-16 14:56:43 PDT

Committed 301662@main (560b0ef798f3): <https://commits.webkit.org/301662@main> Reviewed commits have been landed. Closing PR #52419 and removing active labels.

Radar WebKit Bug Importer

Comment 3 2025-10-16 14:57:12 PDT

<rdar://problem/162809291>

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