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chromium/third_party/blink/web_tests/external/wpt/html/browsers/the-window-object/garbage-collection-and-browsing-contexts/discard_iframe_history_2-1.html 

<!doctype html>
<iframe></iframe>
<script>
var t = opener.t;

onload = t.step_func(function() {
  setTimeout(t.step_func(function() {
     var history_length = history.length;
     var iframe = document.getElementsByTagName("iframe")[0];
     iframe.onload = t.step_func(function() {
       setTimeout(t.step_func(function() {
         opener.assert_equals(history.length, history_length + 1, "History length before iframe removal");
         document.body.innerHTML = "";
         opener.assert_equals(history.length, history_length, "History length after iframe removal");
         t.done();
         window.close();
       }), 100);
     });
     iframe.src = "discard_iframe_history_1-2.html";
  }), 100);
});
</script>