Try it Yourself - XML dom

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (xhttp.readyState == 4 && xhttp.status == 200) {
   myFunction(xhttp);
   }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();

function myFunction(xml) {
   var xmlDoc = xml.responseXML;
   var newNode = xmlDoc.createElement("book");
   var x = xmlDoc.documentElement;
   var y = xmlDoc.getElementsByTagName("book");
   document.getElementById("demo").innerHTML =
   "Book elements before: " + y.length + "<br>";

   x.insertBefore(newNode, y[3]);
   document.getElementById("demo").innerHTML +=
   "Book elements after: " + y.length;
}
</script>

</body>
</html>