cross-frame-iframe-with-explicit-domain-set.html

<html>
<head>
</head>
<body>
    <p id='accessMe'></p>
    <p>Inner iframe with explicit document.domain set.</p>
    <script>
        document.domain = "127.0.0.1";
        parent.postMessage("LOADED", "*");
    </script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/security/resources/cross-frame-iframe-with-explicit-domain-set.html