chromium/third_party/blink/web_tests/http/tests/security/isolatedWorld/resources/userGestureEvents-second-window.html

<!DOCTYPE html>
<html>
<title>Event handlers in isolated worlds for user gesture generated events should should the same permissions as handlers within the page (resource)</title>
<script>

// success!
window.opener.pass();
window.close();

</script>
<body>
</body>
</html>