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.
59 lines
2.0 KiB
HTML
59 lines
2.0 KiB
HTML
<!DOCTYPE html>
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<script src="../include.js"></script>
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<div id="host"></div>
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<div id="bystanders"></div>
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<script>
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function settleAndReset(triggerElement) {
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getComputedStyle(triggerElement).opacity;
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getComputedStyle(triggerElement).opacity;
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internals.resetStyleInvalidationCounters();
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}
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function verifyInvalidationsStayBounded(label, maxInvalidations) {
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const invalidations = internals.getStyleInvalidationCounters().styleInvalidations;
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if (invalidations <= maxInvalidations)
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println(`PASS: ${label} (${invalidations} invalidations)`);
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else
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println(`FAIL: ${label} (${invalidations} invalidations)`);
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}
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test(() => {
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const host = document.getElementById("host");
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const bystanders = document.getElementById("bystanders");
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for (let i = 0; i < 25; ++i) {
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const bystander = document.createElement("div");
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bystander.textContent = `bystander ${i}`;
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bystander.style.animationName = "fade";
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bystander.style.animationDuration = "1s";
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bystander.style.animationFillMode = "both";
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bystanders.appendChild(bystander);
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}
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const shadowRoot = host.attachShadow({ mode: "open" });
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shadowRoot.innerHTML = `
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<style>
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#target {
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animation-name: fade;
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animation-duration: 1s;
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animation-fill-mode: both;
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}
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</style>
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<div id="target">shadow target</div>
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`;
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const target = shadowRoot.getElementById("target");
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const sheet = shadowRoot.querySelector("style").sheet;
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settleAndReset(target);
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sheet.insertRule(`
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@keyframes fade {
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from { opacity: 0.25; }
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to { opacity: 0.25; }
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}
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`, sheet.cssRules.length);
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getComputedStyle(target).opacity;
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verifyInvalidationsStayBounded("shadow-local keyframes insert ignores matching light-DOM bystanders", 4);
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});
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</script>
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