<!DOCTYPE html>
<html>
<body>
<p>Click the button to loop from 1 to 6, to make HTML headings.</p>
<button onclick="myFunction()">Try it</button>
<div id="demo"></div>
<script>
function myFunction() {
var x ="", i;
for (i=1; i<=6; i++) {
x = x + "<h" + i + ">Heading " + i + "</h" + i + ">";
}
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>