JSFiddle - React, Tailwind, and code Playground

HTML

<script>
    
function get()
{
alert("HI");
}
</script>

JavaScript

var dfom = document.createElement('div');
dfom.setAttribute("id","options");

dfom.innerHTML = "<input type=\"button\" value=\"Say HI\">";
dfom.firstChild.addEventListener('click', get);
dfom.style.padding = '10px';
document.body.insertBefore(dfom, document.body.firstChild);