NEW316463
[css-anchor-position-1] Pseudo-elements that no longer exist are still in m_anchorPositionedToAnchorMap 
https://bugs.webkit.org/show_bug.cgi?id=316463
Summary [css-anchor-position-1] Pseudo-elements that no longer exist are still in m_a...
Kiet Ho
Reported 2026-06-05 17:32:10 PDT
This addresses the root cause of bug 316441. m_anchorPositionedToAnchorMap is keyed on WeakStyleable. WeakStyleable is null if the Element is null, but not if the Styleable is a pseudo-element, and the pseudo-element no longer exists (by that I mean, RenderTreeUpdater::GeneratedContent::updateBeforeOrAfterPseudoElement determines a pseudo-element is no longer needed and clears it). Hence it's possible for stale pseudo-elements to still be in m_anchorPositionedToAnchorMap
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Radar WebKit Bug Importer
Comment 1 2026-06-05 17:32:17 PDT
<rdar://problem/178860223>
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