JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>Minimal react</title>
</head>

<body>
    <div id="root"></div>

    <script crossorigin src="https://unpkg.com/@babel/standalone/babel.js"></script>
    <script crossorigin src="https://unpkg.com/react@18/umd/react.development.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
    <script type="text/jsx">
        ReactDOM.createRoot(document.getElementById('root')).render(<MyApp/>)

        function MyApp() {
            return  <h1>Hello world!</h1>
        }
    </script>
</body>

</html>