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36 lines
1.3 KiB
HTML
36 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: no layout shift if transform change counters location 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 and the location at the same time, and the values
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// cancel each other visually, for which no shift should be reported.
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transformed.style.transform = 'translateY(100px)';
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transformed.style.top = '-100px';
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transformed.style.left = '20px';
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// Change size of child, for which no shift should be reported, either.
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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 if transform change counters location change');
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</script>
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