JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hello"> </div>

CSS

#hello {
    background-color: orange;
    width: 100px;
    height: 100px;
}

JavaScript

var d = document.getElementById("hello");
d.addEventListener("click", function(event) {
    alert(event);
});
d.addEventListener("mouseover", function (event) {
  d.innerHTML = "<span>Hello World</span>";
});