<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 1px solid black;
margin: 5px;
}
</style>
</head>
<body>
<p>Click the button to add a background color to the second child node (index 1) of div.</p>
<button onclick="myFunction()">Try it</button>
<div id="myDIV">
<p>First p element</p>
<p>Second p element</p>
</div>
<p><strong>Note:</strong> Whitespace inside elements is considered as text, and text
is considered as nodes. In this example, index 0, 2 and 4 in DIV are text nodes.</p>
<script>
function myFunction() {
var c = document.getElementById("myDIV").childNodes;
c[1].style.backgroundColor = "yellow";
}
</script>
</body>
</html>