chromium/third_party/blink/web_tests/fast/loader/document-write-after-form-submit.html

<form id="f"  method="get" action="resources/pass-and-notify-done.html"></form>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
f.submit();
document.open();
document.write("This should not cancel the form submission");
</script>