File: iframe-append-to-child-document.html

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<!doctype html>
<meta charset=utf-8>
<title>Append iframe element to its own child document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id=x></iframe>
<script>
test(function() {
  var iframe = document.getElementById('x');
  var childWindow = iframe.contentWindow;
  assert_equals(childWindow.parent, window);
  childWindow.document.body.appendChild(iframe);
  assert_equals(childWindow.parent, null);
  assert_equals(iframe.contentWindow, null);
  assert_equals(childWindow.document.body.firstChild, iframe);
});
</script>