27 lines
900 B
HTML
27 lines
900 B
HTML
<!DOCTYPE html>
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<title>Layout Instability: movement of fixed position</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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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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<div id="target" style="position: fixed; top: 100px; width: 300px; height: 200px; background: yellow">
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</div>
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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 position of the div.
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target.style.top = '200px';
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const expectedScore = computeExpectedScore(300 * (200 + 100), 100);
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// Observer fires after the frame is painted.
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assert_equals(watcher.score, 0);
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await watcher.promise;
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assert_equals(watcher.score, expectedScore);
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}, 'Movement of fixed position');
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</script>
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