File: visible-to-hidden.html

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<!DOCTYPE html>
<title>Layout Instability: visibility:hidden</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<div id="target" style="position: absolute; top: 0; width: 400px; height: 400px; background: blue;"></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 and make hidden at the same time. Should not be reported!
  document.querySelector("#target").style.top = '200px';
  document.querySelector("#target").style.visibility = 'hidden';

  await waitForAnimationFrames(2);
  // No shift should be reported.
  assert_equals(watcher.score, 0);
}, 'visible to hidden');

</script>