mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-01 20:17:13 +02:00
928a5247ff
Avoid broad document invalidation when adding or removing ordinary document-owned or shadow-owned stylesheets. Reuse the targeted StyleSheetInvalidation path for style rules, including shadow-host escapes, pseudo-element-only selectors, and trailing-universal cases. Keep the broad path for sheet contents whose effects are not captured by selector invalidation alone, including @property, @font-face, @font-feature-values, @keyframes, imported sheets, and top-level @layer blocks. Broad-path shadow-root sheets still reach host-side consumers through their active-scope effects.
41 lines
1.5 KiB
HTML
41 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<script src="../include.js"></script>
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<div id="target">target</div>
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<script>
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function settleAndReset(triggerElement) {
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getComputedStyle(triggerElement).color;
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getComputedStyle(triggerElement).color;
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internals.resetStyleInvalidationCounters();
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}
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function verifyNoFullRestyleWasScheduled(label) {
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const invalidations = internals.getStyleInvalidationCounters().fullStyleInvalidations;
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if (invalidations === 0)
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println(`PASS: ${label}`);
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else
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println(`FAIL: ${label} (${invalidations} full invalidations)`);
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}
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test(() => {
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const target = document.getElementById("target");
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settleAndReset(target);
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const inactiveStyle = document.createElement("style");
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// This sheet still contains a non-style rule that would require broad
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// invalidation if it were active, so keeping the counter at zero proves
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// we only consider effective rules after media evaluation.
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inactiveStyle.media = "print";
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inactiveStyle.textContent = "@layer B, A;";
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document.head.appendChild(inactiveStyle);
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getComputedStyle(target).color;
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verifyNoFullRestyleWasScheduled("inactive media stylesheet add does not schedule full restyle");
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settleAndReset(target);
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inactiveStyle.remove();
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getComputedStyle(target).color;
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verifyNoFullRestyleWasScheduled("inactive media stylesheet remove does not schedule full restyle");
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});
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</script>
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