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Test Info: Warnings

<!DOCTYPE html>
<title>Layout Instability: multi clip visual rect</title>
<link rel="help" href="" />
body { margin: 0; }
#outer { width: 200px; height: 600px; overflow: hidden; }
#inner { width: 300px; height: 150px; overflow: hidden; }
#j { position: relative; width: 300px; height: 600px; background: blue; }
<div id='outer'><div id='inner'><div id='j'></div></div></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);
document.querySelector("#j") = "-200px";
// Note that, while the element moves up 200px, its visibility is
// clipped at 0px,150px height, so the additional 200px of vertical
// move distance is not included in the score.
// (clip width 200) * (clip height 150)
const expectedScore = computeExpectedScore(200 * 150, 200);
await watcher.promise;
assert_equals(watcher.score, expectedScore);
}, "Multi clip visual rect.");