This example demonstrates a minimal React setup for rendering a full-page greeting. It uses React 17 and ReactDOM to mount a single functional component, App, which outputs the text “Hello React!” styled with a large, centered font size. The JavaScript files are bundled into a single bundle.js file, loaded by the index.html page alongside the React and ReactDOM libraries from unpkg. The code highlights the basic structure of a React application without any data processing or visualization logic.