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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/document-write/iframe_006.html 

<!doctype html>
<title>document.write external script into iframe write back into parent</title>
<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script>
<iframe id="test"></iframe>
<script>
var t = async_test();
var iframe = document.getElementById("test");
var order = [];
t.step(function() {
  order.push(1);
  var s = "<script>parent.order.push(2); parent.document.write('<script>order.push(3); iframe.contentDocument.write(\"<script>parent.order.push(4)</script\"+\">\");order.push(5);</script' + '>'); parent.order.push(6)</script"+">";
  iframe.contentDocument.write(s);
  iframe.contentDocument.close();
  order.push(7);
  assert_array_equals(order, [1,2,3,4,5,6,7]);
});
t.done();
</script>
<div id="log"></div>