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HTML DOM replaceChild() Method in JAVA SCRIPT

Definition and Usage..
The replaceChild() method replaces a child node with a new node.
The new node could be an existing node in the document, or you can create a new node.
Tip: Use the removeChild() method to remove a child node from an element.
Syntax: node.replaceChild(newnode, oldnode)
Different way to how to declare replaceChild()  in program.
CODING:
<!DOCTYPE html>
<html>
<body>
<p>Click the button to replace the first item in the the list.</p>
<ul id="List1"><li>XHTML</li><li>CSS</li><li>JAVA SCRIPT</li></ul>
<button onclick="replaceElement()">Replace Element</button>
<ul id="List2"><li>Coffee</li><li>Tea</li><li>Milk</li></ul>
<button onclick="replacetext()">Replace Text</button>
<script>
function replaceElement() {
    var elmnt = document.createElement("h3");
    var textnode = document.createTextNode("Languages");
    elmnt.appendChild(textnode);//also define,elmnt.innerHTML="";
    var item = document.getElementById("List1");
    item.replaceChild(elmnt, item.childNodes[0]);
}
function replacetext() {
   var textnode = document.createTextNode("Water");
   var item = document.getElementById("List2").childNodes[0];
   item.replaceChild(textnode, item.childNodes[0]);
 //also define,var item = document.getElementById("List2").childNodes[0].innerHTML="fd";
}
</script>
</body>
</html>

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