JSFiddle - React, Tailwind, and code Playground

HTML

<div onmousemove="m();">
    <h1>Click me</h1>
</div>
<div id="counter" style="margin-top:20px">0</div>

JavaScript

m = function() {
    document.getElementById("counter").textContent = Number(document.getElementById("counter").textContent) + 1;
}