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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/support/navigation-changed-iframe.html 

<html>
<head>
    <script>
        function fireSentinel()
        {
            document.getElementsByTagName('h4')[0].innerHTML = document.domain;
        }
    </script>
</head>
<body onload="fireSentinel();">
    <h4>DOMAIN</h4>
    <p>PASSED: Navigation succeeded.</p>
</body>
</html>