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.
29 lines
961 B
HTML
29 lines
961 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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/* Two different :has() rules on the same anchor. Each has a different
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argument, so changes to either argument class should trigger match
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re-evaluation. */
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.anchor:has(.red) { color: red; }
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.anchor:has(.blue) { background: blue; }
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</style>
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<div class="anchor" id="anchor">
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<span id="target">target</span>
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</div>
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<script>
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test(() => {
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settleAndReset();
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document.getElementById("target").classList.add("red");
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("add .red (only :has(.red) flips)");
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internals.resetStyleInvalidationCounters();
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document.getElementById("target").classList.add("blue");
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getComputedStyle(document.getElementById("anchor")).color;
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printCounters("add .blue (only :has(.blue) flips, .red stable)");
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});
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</script>
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