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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/unload/009.html 

<!doctype html>
<title>unload IDL attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var iframe;
var t = async_test();
onload = function() {
  setTimeout(function() {
    var iframe = document.getElementsByTagName("iframe")[0];
    iframe.src="about:blank";
  }, 100)
}
</script>
<iframe src="009-1.html"></iframe>