<!DOCTYPE html>
<html>
<body>
<p>Click the button to create a h1 element with some text.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var h = document.createElement("H1");
var t = document.createTextNode("Hello World");
h.appendChild(t);
document.body.appendChild(h);
}
</script>
</body>
</html>