JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<head>
<title>Example title</title>
</head>
<body>

<script type="text/javascript">
document.getElementById("btnTest").addEventListener("click", () => {
  alert("I just clicked the button");
});
</script>

<button id="btnTest">Click me</button>
</body>
</html>