This example demonstrates how to integrate React with a static HTML page, displaying the text “Hello World” in a large, centered message. It uses React 16.10.0 and ReactDOM to render the application. The page includes an HTML `<pre>` element with an ID of `message-element`, which the JavaScript file `index.js` updates directly by setting its `textContent` property. This shows a minimal setup where React components are not yet used, relying instead on plain DOM manipulation within a React-enabled project structure.