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chromium/third_party/blink/web_tests/external/wpt/layout-instability/contain-paint-fully-clipped.html 

<!DOCTYPE html>
<title>Layout Instability: fully clipped by contain:paint</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<div style="contain: paint; height: 0; position: relative">
  <div id="target" style="position: absolute; top: 0; width: 400px; height: 400px; background: blue"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<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 hidden.
  document.querySelector("#target").style.top = '200px';

  await waitForAnimationFrames(2);
  // No shift should be reported.
  assert_equals(watcher.score, 0);
}, 'fully clipped by contain:paint');

</script>