37 lines
1.1 KiB
HTML
37 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<title>Layout Instability: shift inside a transformed container</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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#container { transform: translateX(-300px) translateY(-40px); }
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#shifter { position: relative; width: 600px; height: 140px; background: blue; }
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</style>
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<div id="container">
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<div id="shifter"></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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// 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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document.querySelector("#shifter").style = "top: 60px";
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// The shifter has size 600 x 140, but the container's transform
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// reduces its viewport overlap.
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const expectedScore = computeExpectedScore(
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(600 - 300) * (140 - 40 + 60), 60);
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await watcher.promise;
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assert_equals(watcher.score, expectedScore);
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}, 'Transformed container.');
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</script>
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