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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/unload/004.html 

<!doctype html>
<title>pagehide / unload event order</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test();

var events = [];

onload = function() {setTimeout(function() {
  var iframe = document.getElementsByTagName("iframe")[0]

  iframe.onload = function() {
                    setTimeout(function() {
                                 iframe.contentWindow.location="001-2.html";
                               }, 100);
                    iframe.onload = t.step_func(function() {
                                                  assert_array_equals(events, ["pagehide", "unload"])
                                                  t.done()});
                  };

  iframe.src = "004-1.html?" + Math.random();

}, 100)};

</script>
<iframe></iframe>