36 lines
1 KiB
HTML
36 lines
1 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: shift into viewport</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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#j { position: absolute; width: 600px; height: 200px; top: 100%; background: blue; }
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</style>
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<div id='j'></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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// Move div partially into viewport.
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document.querySelector("#j").style.top =
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document.documentElement.clientHeight - 200 + "px";
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// The element moves from outside the viewport to within the viewport, which
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// should generate a shift.
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// (width 600) * (height 0 + move 200)
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const expectedScore = computeExpectedScore(600 * 200, 200);
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await watcher.promise;
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assert_equals(watcher.score, expectedScore);
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}, "Shift into viewport.");
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</script>
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