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HTML DOM documentElement Property in JAVA SCRIPT

Definition and Usage..
The documentElement property returns the documentElement of the document, as an Element object.
For HTML documents the returned object is the html element.
Note: This property is read-only.
Tip: The difference between this property and the document.body property, is that the document.body element returns the body element, while the document.documentElement returns the html element
Syntax: document.documentElement
CODING:
<!DOCTYPE html>
<html>
<body>
<p>Click the button to display the node name of the documentElement.</p>
<button onclick="DisplayNode()">Display Node</button>
<h2></h2>
<h3></h3>
<p id="a"></p>
<script>
function DisplayNode(){
   var rootElement = document.documentElement;
   document.getElementsByTagName("H2")[0].innerHTML=rootElement;
   var firstTier = rootElement.childNodes;
   document.getElementsByTagName("H3")[0].innerHTML=firstTier;
   var p=document.getElementById("a");
    for(var i=0 ; i < firstTier.length ; i++) {
      p.innerHTML = p.innerHTML + firstTier[i] + "<br>";
    }
}
</script>
</body>
</html>

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