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<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        myFunction(this);
    }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
    var x, newCDATA, xmlDoc;
    xmlDoc = xml.responseXML;
    newCDATA = xmlDoc.createCDATASection("Special Offer & Book Sale");
    x = xmlDoc.getElementsByTagName("book")[0];
    x.appendChild(newCDATA);
    document.getElementById("demo").innerHTML = x.lastChild.nodeValue;
}
</script>
</body>
</html>