36 lines
1,020 B
HTML
36 lines
1,020 B
HTML
<!DOCTYPE html>
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<title>Layout Instability: clip with negative bottom margin</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<style>
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#scroller { overflow: scroll; width: 200px; height: 500px; }
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#space { height: 1000px; margin-bottom: -500px; }
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#j { width: 150px; height: 150px; background: yellow; }
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</style>
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<div id='scroller'>
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<div id='space'></div>
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<div id='j'></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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// Increase j's top margin by 100px. Since j is fully clipped by the scroller,
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// this should not generate a shift.
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document.querySelector("#j").style.marginTop = "100px";
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await waitForAnimationFrames(3);
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assert_equals(watcher.score, 0);
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}, "Clip with negative bottom margin.");
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</script>
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