33 lines
1.1 KiB
HTML
33 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: visibility:hidden change with layout</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<div id="target" style="position: absolute; top: 0; width: 200px; height: 200px; visibility: hidden; background: blue"></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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// Shift target, for which no shift should be reported because it's hidden.
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target.style.top = '200px';
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target.style.visibility = 'visible';
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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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// Shift again, for which shift should be reported.
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target.style.top = '300px';
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await watcher.promise;
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const expectedScore = computeExpectedScore(200 * (200 + 100), 100);
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assert_equals(watcher.score, expectedScore);
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}, 'visibility:hidden change with layout');
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</script>
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