<!DOCTYPE html>
<html>
<head>
</head>
<body>
<p>Click the button to create a BASE element.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.createElement("BASE");
x.setAttribute("href", "http://www.w3ii.com");
document.head.appendChild(x);
document.getElementById("demo").innerHTML = "You have now created a BASE element in the HEAD section of your document.";
}
</script>
</body>
</html>