<!DOCTYPE html>
<title>document.open and singleton replacement</title>
<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-document-open">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test();
function report(actual, expected, message) {
  t.step(function() {
    assert_equals(actual, expected, message);
  });
}
function done() {
  t.done();
}
</script>
<iframe src=document.open-03-frame.html></iframe>