<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Querying keyframes for an effect in a removed iframe should not crash
  </title>
<link rel="help" href="https://www.w3.org/TR/web-animations-1/#dom-keyframeeffect-getkeyframes">
</head>
<body>
  <div id="target"></div>
  <iframe id="iframe"></iframe>
</body>
<script type="text/javascript">
  const target = document.getElementById('target');
  const iframe = document.getElementById('iframe');
  const keyframes = [{ background: 'green' }, { background: 'blue' }, ];
  const effect = new iframe.contentWindow.KeyframeEffect(target, keyframes);
  iframe.parentNode.removeChild(iframe);
  const result = effect.getKeyframes();
</script>
</html>
