JSFiddle - React, Tailwind, and code Playground

HTML

<!-- JavaScript using the script tag-->
<html>
    <head>
      <title> Hello World</title>
    </head>
    
    <body>
      <h1>Hello, World!</h1>
      
      <script type="text/javascript" src="helloWorld.js"></script>   
    </body>
</html>

JavaScript

alert("hello world!");