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Test Info: Warnings

<!DOCTYPE html>
<title>Layout Instability: shift outside viewport</title>
<link rel="help" href="" />
body { margin: 0; }
#j { position: absolute; width: 600px; height: 200px; top: 100%; background: blue; }
<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);
// Move div even further out of viewport.
document.querySelector("#j") =
document.documentElement.clientHeight + 200 + "px";
// Since the element moves entirely outside of the viewport, it shouldn't
// generate a score.
await waitForAnimationFrames(3);
assert_equals(watcher.score, 0);
}, "Shift outside viewport.");