prompt-and-unload-script-closeable.html

<!doctype html>
<title>beforeunload and unload events fire after window.close() in script-closeable browsing context</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
beforeunload_fired = false;
var t = async_test();

onload = t.step_func(function() {
  window.close();
});

onbeforeunload = t.step_func(function() {
  beforeunload_fired = true;
});

onunload = t.step_func(function() {
  assert_true(beforeunload_fired);
  t.done()
});
</script>

chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/unloading-documents/prompt-and-unload-script-closeable.html