<!DOCTYPE html>
<html>
<body>
<p>Click the button get the node value of the first button element in the document.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> Text inside elements are considered to be text nodes, so we return the node value of the button element's first child (childNodes[0]).</p>
<p id="demo"></p>
<script>
function myFunction() {
var c = document.getElementsByTagName("BUTTON")[0];
var x = c.childNodes[0].nodeValue;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>