mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
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.
32 lines
1.0 KiB
HTML
32 lines
1.0 KiB
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(.match) { color: red; }
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</style>
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<div class="anchor" id="anchor">
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<div id="container">
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<span>existing</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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// Insert an already-matching element. The freshly inserted node has
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// no in_has_scope flag; invalidation must run via the parent.
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const child = document.createElement("span");
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child.className = "match";
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document.getElementById("container").appendChild(child);
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("insert <span class='match'> into anchor subtree");
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internals.resetStyleInvalidationCounters();
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// Remove the matching element. Anchor should unstyle.
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child.remove();
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("remove the matching span");
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});
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</script>
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