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chromium/third_party/blink/web_tests/external/wpt/scroll-animations/scroll-timelines/scroll-timeline-in-removed-iframe-crash.html 

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Starting an animation with a scroll timeline in a removed iframe
         should not crash</title>
</head>
<body>
  <div id="target"></div>
  <iframe id="frame"></iframe>
</body>
<script type="text/javascript">
  const target = document.getElementById('target');
  const frame = document.getElementById('frame');
  const timeline = new frame.contentWindow.ScrollTimeline();
  frame.remove();
  target.animate(null, {timeline: timeline});
</script>
</html>