33 lines
1.1 KiB
HTML
33 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: no layout shift for transform change</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<style>
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body { margin: 0; }
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#transformed { position: relative; transform: translateX(20px); width: 100px; height: 100px; background: blue; }
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#child { width: 400px; height: 400px; }
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</style>
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<div id="transformed">
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<div id="child"></div>
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</div>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="resources/util.js"></script>
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<script>
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promise_test(async () => {
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const watcher = new ScoreWatcher;
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// Wait for the initial render to complete.
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await waitForAnimationFrames(2);
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// Modify the transform, for which no shift should be reported.
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document.querySelector("#transformed").style = "transform: translateY(100px)";
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// Change size of child, for which no shift should be reported, either.
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document.querySelector("#child").style = "width: 300px";
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await waitForAnimationFrames(2);
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// No shift should be reported.
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assert_equals(watcher.score, 0);
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}, 'no layout shift for transform change');
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</script>
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