<!DOCTYPE html>
<html>
<body>
    <p>Reporting Frame...</p>
    <script>
        function onMessage(event) {
            var p = document.createElement(p);
            p.textContent = event.data;
            document.body.appendChild(p);
            window.parent.postMessage(event.data, "*");
        }

        window.addEventListener(
            "message",
            onMessage,
            false
        );
    </script>
    <iframe src='{{GET[subframe]}}' name="deepframe"></iframe>
</body>
</html>