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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/unload/003.html 

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

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

  iframe.onload = function() {
                    setTimeout(function() {
                                 iframe.contentWindow.location="002-2.html";
                               }, 100);
                    iframe.onload = t.step_func(function() {t.done()});
                  };

  do_test = function(e) {
    assert_equals(e.type, "unload");
    assert_equals(e.target, iframe.contentDocument);
    assert_equals(e.currentTarget, iframe.contentWindow);
    assert_false(e.bubbles, "bubbles");
    assert_false(e.cancelable, "cancelable");
  }

  iframe.src = "003-1.html?" + Math.random();

}, 100)};

</script>
<iframe></iframe>