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Test Info: Warnings

<!DOCTYPE html>
<title>Layout Instability: opacity:0</title>
<link rel="help" href="" />
<div id="target" style="position: absolute; top: 0; width: 400px; height: 400px; opacity: 0; background: blue">
<div id="child" style="position: relative; top: 0; width: 200px; height: 200px; opacity: 0.5; background: yellow"></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);
// Shift target, for which no shift should be reported because it's not visible. = '200px';
await waitForAnimationFrames(2);
assert_equals(watcher.score, 0);
// Shift child, for which no shift should be reported, either. = '100px';
await waitForAnimationFrames(2);
assert_equals(watcher.score, 0);
}, 'opacity:0');