In this example, we create an html element in JavaScript.
<script>
function addStuff(){
var btn = document.createElement("INPUT");
var t = document.createTextNode("CLICK ME");
btn.setAttribute("type", "button");
btn.setAttribute("value", "Click This");
btn.setAttribute("onclick", "alert('you did it!')");
//appendChild(t);
//document.body.appendChild(btn);
document.getElementById("output").appendChild(btn);
var txt = document.createTextNode("This is exciting text!");
document.getElementById("output").appendChild(txt);
}
</script>