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https://github.com/LadybirdBrowser/ladybird
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Introduce a small set of counters on Document that track the work done while processing :has() invalidation: how often the upward walk runs, how many elements it visits, how often matches_has_pseudo_class() is invoked, how well the per-pass result cache performs, and how many elements transition from clean to needs-style-update. Expose the counters through internals so tests can assert precise bounds on the invalidation work triggered by a mutation, which regular reference tests cannot express. Add a css-has-invalidation test suite that covers subject-position, non-subject-position, sibling-combinator, and no-:has() cases. The baseline tests share a helper script so later coverage can reuse the same counter-printing path. The counters are test-only observation; they do not affect style computation itself.
27 lines
887 B
HTML
27 lines
887 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(.match) .styled { color: red; }
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</style>
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<div id="a1">
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<div id="a2" class="anchor">
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<div id="a3">
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<span id="styled" class="styled">styled</span>
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<span id="target">target</span>
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</div>
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</div>
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</div>
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<script>
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test(() => {
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getComputedStyle(document.getElementById("styled")).color;
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internals.resetStyleInvalidationCounters();
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// Non-subject :has(): the :has() qualifies an ancestor, styling descendants.
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// Adding .match on target should invalidate the anchor path and re-style .styled.
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document.getElementById("target").classList.add("match");
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getComputedStyle(document.getElementById("styled")).color;
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printCounters("after add .match on target");
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});
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</script>
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