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https://github.com/LadybirdBrowser/ladybird
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85ff13870f
A DOM mutation under a document that uses any :has() rule currently walks every ancestor up to the root, invoking invalidate_style_if_ affected_by_has() on each. Most of those ancestors have nothing to do with :has(), so the work scales linearly with DOM depth. Introduce an in_has_scope flag on Element, set while evaluating :has() arguments for invalidation metadata. StyleScope's upward invalidation walk now terminates at the first element that is neither in :has() scope nor a :has() anchor, so it only traverses the region where some :has() rule might actually care about the change. Keep the existing fast :has() matching paths for normal selector matching, but bypass them while collecting per-element metadata so the scope markers still get populated. Node insertion also schedules the parent for the :has() walk so newly inserted nodes still reach the real anchor. The css-has-invalidation suite adds focused coverage for these shapes and updates the expected counters to reflect the shorter walks.
15 lines
401 B
Plaintext
15 lines
401 B
Plaintext
[add .red (only :has(.red) flips)]
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hasAncestorWalkInvocations: 1
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hasAncestorWalkVisits: 2
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hasMatchInvocations: 2
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hasResultCacheHits: 0
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hasResultCacheMisses: 2
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styleInvalidations: 1
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[add .blue (only :has(.blue) flips, .red stable)]
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hasAncestorWalkInvocations: 1
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hasAncestorWalkVisits: 2
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hasMatchInvocations: 2
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hasResultCacheHits: 0
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hasResultCacheMisses: 2
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styleInvalidations: 1
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