W3Schools Tryit Editor

main.jsx

index.html

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

class Car extends React.Component {
  constructor() {
    super();
    this.state = {color: "red"};
  }
  render() {
    return <h2>I am a {this.state.color} Car!</h2>;
  }
}

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

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