This example demonstrates a minimal React application that renders a static text message. The code defines a functional component, `App`, which returns a simple "Hello React!" message, and then mounts it to the DOM using `ReactDOM.render` targeting the `root` element. The setup relies on the React and ReactDOM libraries, loaded via a CDN, along with a custom `bundle.js` file. The page itself is styled with CSS to remove margins and hide overflow, serving as a foundational template for integrating React into a visualization context.