<!DOCTYPE html>
<html>
<body>
<ul id="myList"><li>Coffee</li><li>Tea</li><li>Milk</li></ul>
<p>Click the button to replace the first item in the the list.</p>
<button onclick="myFunction()">Try it</button>
<p>First create a new li element and a Text node called Water.<br>Then we append the text node to li.<br>Then we replace the first child node of the ul element, with the newly created li element.</p>
<p><strong>Note:</strong> This example replaces the entire LI element.</p>
<script>
function myFunction() {
var elmnt = document.createElement("li");
var textnode = document.createTextNode("Water");
elmnt.appendChild(textnode);
var item = document.getElementById("myList");
item.replaceChild(elmnt, item.childNodes[0]);
}
</script>
</body>
</html>