<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to replace this document with new content.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
document.open("text/html","replace");
document.write("<h2>Learning about the HTML DOM is fun!</h2>");
document.close();
}
</script>
</body>
</html>