layout-instability/display-change-with-transform.html

<!DOCTYPE html>
<title>Layout Instability: change display type with transform</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>
  div {
    width: 100px;
    height: 100px;
    background: blue;
  }
  #target {
    transform: translateX(0);
  }
</style>
<div id=target>
  <div id=shift>test</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;
  await waitForAnimationFrames(2);

  target.style.display = 'flex';

  await waitForAnimationFrames(1);

  assert_equals(watcher.score, 0);
}, 'Shift accompanied by body display change.');

</script>