<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
  window.onload = t.step_func_done(() => assert_equals(i.contentDocument.body.innerText, "PASS"));

  var i = document.createElement('iframe');
  i.id ='i';
  i.src = "javascript:'FAIL'";
  document.body.appendChild(i);
  i.contentDocument.open();
  i.contentDocument.write("PASS")
  i.contentDocument.close();
});
</script>
</body>