51 lines
1.2 KiB
HTML
51 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: shift accompanied by body display 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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#cont {
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background: white;
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width: 300px;
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height: 200px;
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}
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#ch {
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background: blue;
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position: relative;
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width: 300px;
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height: 100px;
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top: 100px;
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}
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</style>
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<style id="s"></style>
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<div id="cont">
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<div id="ch"></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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await waitForAnimationFrames(2);
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document.querySelector("#s").innerHTML = `
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body {
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display: flex;
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flex-direction: column;
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}
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#ch { top: 0; }
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`;
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// An element of size (300 x 100) has shifted by 100px.
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const expectedScore = computeExpectedScore(300 * (100 + 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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}, 'Shift accompanied by body display change.');
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</script>
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