<html>
<body><p id="demo">Click the button to see how many child nodes the body element has:</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var x=document.getElementById("demo");
x.innerHTML=document.body.childNodes.length;
}
</script>
<p><strong>Note:</strong> Whitespace between/inside elements is considered as text, and text
is considered as nodes.</p>
</body>
</html>