text: <!DOCTYPE html>
  <title>moving modified IFRAME in document (original page about:blank, document.write modification)</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <link rel="help" href="https://html.spec.whatwg.org/#iframe-load-event-steps">
  <iframe src="about:blank"></iframe>
  <div id="target"></div>
  <script>
  setup({ single_test: true });
  onload = function() {
    var ifr = document.getElementsByTagName('iframe')[0];
    ifr.contentDocument.open();
    ifr.contentDocument.write('Modified document');
    ifr.contentDocument.close();
    setTimeout(function() {
      ifr.onload = function() {
          assert_equals(ifr.contentDocument.body.textContent.indexOf('Modified'), -1);
          done();
      };
      document.getElementById('target').appendChild(ifr);
    }, 100);
  }
  </script>
  