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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/document-write/iframe_001.html 

<!doctype html>
<title>document.write into iframe</title>
<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script>
<iframe id="test"></iframe>
<script>
test(
function() {
  var iframe = document.getElementById("test");
  iframe.contentDocument.write("Filler Text");
  iframe.contentDocument.close();
  assert_equals(iframe.contentDocument.body.textContent, "Filler Text");
});
</script>
<div id="log"></div>