testing/web-platform/tests/content-security-policy/frame-ancestors/reporting-frame-allows-self.html


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<!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
        );
        
        window.parent.postMessage("start test", "*");
    </script>
</body>
</html>