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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; background: blue;">
<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'; = 0;
await waitForAnimationFrames(2);
assert_equals(watcher.score, 0);
}, 'opacity non-zero to zero');