W3Schools Tryit Editor

main.jsx

index.html

import { createRoot } from 'react-dom/client'

function Greeting({ name, age }) {
  return <h1>Hello, {name}! You are {age} years old.</h1>;
}
  
createRoot(document.getElementById('root')).render(
  <Greeting name="John" age={25} />
);

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