W3Schools Tryit Editor

main.jsx

index.html

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

function Counter() {
  // Destructuring the array returned by useState
  const [count, setCount] = useState(0);
  
  return (
    <button onClick={() => setCount(count + 1)}>
      Count: {count}
    </button>
  );
}

createRoot(document.getElementById('root')).render(
  <Counter />
);

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