RESOLVED WONTFIX299630
Update popover UA default stylesheet to use place-self: dialog to avoid conflicting with anchor positioning 
https://bugs.webkit.org/show_bug.cgi?id=299630
Summary Update popover UA default stylesheet to use place-self: dialog to avoid confl...
fantasai
Reported 2025-09-26 13:17:45 PDT
The CSS Working Group recently added a new `dialog` value for align-self/justify-self in order to represent a better default behavior for popovers: centering by default, but using the position-area defaults when anchor-positioned. See https://github.com/whatwg/html/pull/11656 and https://github.com/w3c/csswg-drafts/issues/10258 This is an issue which trips people up a lot when using anchor positioning combined with popovers, see https://github.com/w3c/csswg-drafts/issues/12466 Opening this bug to track implementation of this change.
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Radar WebKit Bug Importer
Comment 1 2025-10-02 11:40:53 PDT
<rdar://problem/161834630>
fantasai
Comment 2 2025-10-02 11:50:25 PDT
Pull request: https://github.com/WebKit/WebKit/pull/51691
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