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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/document.open-03-frame.html 

<!DOCTYPE html>
<script>
onload = function() {
  document.open();
  document.close();
  parent.report(window.setTimeout === setTimeout, true, "setTimeout");
  parent.report(window === this, true, "this");
  parent.done();
}
</script>