prompt-and-unload-script-closeable.html

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This test has a WPT meta file that disables it given conditions:
- : https://bugzilla.mozilla.org/show_bug.cgi?id=1519417
This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/unloading-documents/prompt-and-unload-script-closeable.html - WPT Dashboard Interop Dashboard

<!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>