Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
div {
    border: 1px solid black;
    margin: 15px;
}
</style>
</head>
<body>

<p>Click the button get the node name of the DIV's first child node.</p>

<div id="myDIV">
  <p>A P element - Second child in div</p>
  <span>A Span element - Fourth child in div</span>
</div>

<button onclick="myFunction()">Try it</button>

<p><strong>Note:</strong> Whitespace inside elements is considered as text, and text is considered as nodes. Therefore, in this example, the first, third and fifth child of the div element is a #text node.</p>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("myDIV").firstChild.nodeName;
    document.getElementById("demo").innerHTML = x; 
}
</script>

</body>
</html>