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chromium/third_party/blink/web_tests/external/wpt/web-animations/crashtests/get-computed-timing-crash.html 

<!DOCTYPE html>
<html>
<title>GetComputedTiming on an animation without an execution context,
timeline or playback rate</title>
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1318012">
<meta name="assert" content="This should not crash.">
<body>
  <div id="target"></div>
  <iframe id="iframe"></iframe>
</body>
<script type="text/javascript">
  const keyframeEffect = new KeyframeEffect(target, { opacity: [1, 1] });
  const anim = new iframe.contentWindow.Animation(keyframeEffect, null);
  anim.play();
  anim.playbackRate = 0;
  document.body.removeChild(iframe);
  anim.effect.getComputedTiming();
</script>
</html>