Andreas Kling ce5d0bdfc7 LibWeb: Narrow :has descendant invalidation fanout ...

When a :has() mutation is known to come from a specific subtree, use
that subtree as the mutation root while walking observed ancestors.

Before dirtying an anchor and its non-subject descendants, check whether
any cached :has() rule for that anchor can observe the changed subtree.
This keeps unrelated descendant mutations from invalidating every rule
that merely contains :has().

2026-04-28 15:34:49 +02:00

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