chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/unload/002.html

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

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() {t.done()});
                  };

  function do_test(e) {
    assert_equals(e.type, "pagehide");
    assert_equals(e.target, iframe.contentDocument);
    assert_equals(e.currentTarget, iframe.contentWindow);

    // https://github.com/whatwg/html/issues/6794
    assert_true(e.bubbles, "bubbles");
    assert_true(e.cancelable, "cancelable");

    assert_true(e.persisted, "persisted");
  }

  iframe.src = "002-1.html?" + Math.random();

}, 100)};

</script>
<iframe></iframe>