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chromium/third_party/blink/web_tests/external/wpt/html/dom/elements/global-attributes/cdata-iframe.xhtml 

<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml">
    <body>
        <div id="container"></div>
    </body>

    <script>
        function createXHTMLCase(id) {
            const container = document.getElementById("container");

            const div = document.createElement("div");
            div.dir = "auto";
            div.id = id;

            const cdata = document.createCDATASection("foo");
            const text = document.createTextNode("اختبر");
            div.appendChild(cdata);
            div.appendChild(text);

            container.appendChild(div);

            return [div, cdata];
        }

        window.addEventListener("message", (e) => {
            createXHTMLCase(e.data);
            window.top.postMessage(e.data);
        });

        window.top.postMessage("subframe-loaded");
    </script>
</html>