Tryit Editor v2.9

Edit This Code:
<!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>