mirror of
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.
30 lines
958 B
HTML
30 lines
958 B
HTML
<!DOCTYPE html>
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<script src="../include.js"></script>
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<script src="_helpers.js"></script>
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<style>
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.anchor:has(:is(.a, .b)) { color: red; }
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</style>
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<div class="anchor" id="anchor">
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<div>
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<span id="target">target</span>
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</div>
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</div>
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<script>
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test(() => {
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settleAndReset();
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// .a is in the :is() branch - anchor should restyle.
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document.getElementById("target").classList.add("a");
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("add .a (matches :is() branch)");
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internals.resetStyleInvalidationCounters();
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// Replace .a with .b - anchor still matches via the other :is() branch.
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document.getElementById("target").classList.remove("a");
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document.getElementById("target").classList.add("b");
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("swap to .b (other :is() branch)");
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});
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</script>
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