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Test Info:
- Manifest: dom/base/crashtests/crashtests.list
<script>
function addNew(i,t){
  let n=document.createElement(t);
  n.setAttribute('id', i);
  document.getElementById('a').appendChild(n);
}
document.addEventListener("DOMContentLoaded", function(){
  addNew('b','multicol');
  addNew('c','marquee');
  addNew('d','spacer');
  document.getElementById('a').appendChild(document.createElement('iframe'));
  document.getElementById('b').focus();
  window.frames[0].document.body.appendChild(document.getElementById('c'));
  let o=window.frames[0].document.body.childNodes[0];
  document.getElementById('d').appendChild(o.parentNode.removeChild(o));
  try{window.find('x')}catch(e){}
  window.frames[0].document.body.appendChild(document.getElementById('c'));
});
</script>
<body id='a'></body>