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Test Info: Warnings

<!DOCTYPE html>
<title>Layout Instability: clip with negative bottom margin</title>
<link rel="help" href="" />
#scroller { overflow: scroll; width: 200px; height: 500px; }
#space { height: 1000px; margin-bottom: -500px; }
#j { width: 150px; height: 150px; background: yellow; }
<div id='scroller'>
<div id='space'></div>
<div id='j'></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
promise_test(async () => {
const watcher = new ScoreWatcher;
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
// Increase j's top margin by 100px. Since j is fully clipped by the scroller,
// this should not generate a shift.
document.querySelector("#j").style.marginTop = "100px";
await waitForAnimationFrames(3);
assert_equals(watcher.score, 0);
}, "Clip with negative bottom margin.");