JSFiddle - React, Tailwind, and code Playground

HTML

<script>
var showSuper = function() {
    var btn = document.getElementById('button');
    var spanSuper = "<sup>3</sup>";
    btn.innerHTML= "You Clicked Me " +  spanSuper;
}
</script>
<button name="button" id="button" onclick="showSuper()">Click Me!</button>