35 lines
1 KiB
HTML
35 lines
1 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: no shift for adding/removing position:fixed</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<div id="target" style="width: 100px; height: 100px; background: green;
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position: absolute; top: 200px"></div>
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<div style="height: 2000px"></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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window.scrollTo(0, 1000);
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target.style.position = 'fixed';
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target.style.top = 0;
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await waitForAnimationFrames(3);
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assert_equals(watcher.score, 0);
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window.scrollTo(0, 100);
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target.style.position = 'absolute';
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target.style.top = '200px';
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await waitForAnimationFrames(3);
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assert_equals(watcher.score, 0);
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}, "No shift for adding/removing position:fixed.");
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</script>
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