39 lines
1.3 KiB
HTML
39 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait">
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<title>Update callback should only be called once</title>
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<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
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<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#call-dom-update-callback-algorithm">
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<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
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<meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-500">
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<style>
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#target {
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width: 100px;
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height: 100px;
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background-color: red;
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}
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::view-transition-group(*),
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::view-transition-image-pair(*),
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::view-transition-old(*),
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::view-transition-new(*) {
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animation-play-state: paused;
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}
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</style>
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<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
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<div id="target"></div>
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<script>
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addEventListener("load", () => {
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let updateCallbackCalled = false;
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document.startViewTransition(function() {
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target.style.backgroundColor = updateCallbackCalled ? "red" : "green";
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updateCallbackCalled = true;
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document.startViewTransition(() => {});
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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document.documentElement.classList.remove("reftest-wait");
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});
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});
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});
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});
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</script>
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</html>
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