create and append element in javascript

JavaScript
<html> 
<head> 
<title>t1</title> 
<script type="text/javascript"> 
	function addNode() 
     {var newP = document.createElement("p"); 
	  var textNode = document.createTextNode(" This is a new text node"); 
	  newP.appendChild(textNode);
      document.getElementById("firstP").appendChild(newP); } 
</script> </head> 
<body> <p id="firstP">firstP<p> </body> 
</html>
var newTH = document.createElement('th');
newTH.innerHTML = 'Hello, World!';
newTH.onclick = function () {
    this.parentElement.removeChild(this);
};

var table = document.getElementById('content');
table.appendChild(newTH);
//create and append element
 var node = document.createElement("LI");                 // Create a <li> node

 var textnode = document.createTextNode("Water");         // Create a text node

 node.appendChild(textnode);                              // Append the text to <li>

 document.getElementById("myList").appendChild(node);
Source