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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/assign_before_load.html 

<!doctype html>
<title>Assignment to location before document is completely loaded</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<iframe></iframe>
<script>
var t = async_test();
var history_length;

onload = t.step_func(function() {
  setTimeout(function() {
    history_length = history.length;
    document.getElementsByTagName("iframe")[0].src = "assign_before_load-1.html";
  }, 100);
});

do_test = t.step_func(function() {
    assert_equals(history.length, history_length + 1);
    t.done();
});

</script>