W3Schools Tryit Editor

main.jsx

index.html

import React from 'react';
import { createRoot, createElement } from 'react-dom/client'

const myElement = React.createElement('h1', {}, 'I do not use JSX!');

createRoot(document.getElementById('root')).render(
  myElement
);

<!doctype html>
<html lang="en">
  <body>
    <div id="root"></div>
    <script type="module" src="/src/main.jsx"></script>
  </body>
</html>