<!DOCTYPE html>
<html>
<body><!-- This is a comment node! -->
<p>Click the button get the node names of the body element's child nodes.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> Whitespace inside elements is considered as text, and text
is considered as nodes. Comments are also considered as nodes.</p>
<p id="demo"></p>
<script>
function myFunction() {
var nodelist = document.body.childNodes.length;
document.getElementById("demo").innerHTML = nodelist;
}
</script>
</body>
</html>