This example shows a minimal React application that renders the text “Hello jsx” on a webpage. The app uses React and ReactDOM, loaded via external CDN scripts, with a single functional component defined in index.js. ReactDOM.render targets the root div element in index.html, displaying the styled heading at a large font size. React 16.7.0 and ReactDOM 17.0.1 are the concrete libraries used, with JSX syntax in the component.