This example displays a static “Hello World” message in a `<pre>` element alongside a React application. The code uses ReactDOM’s `render` method to mount an `<App />` component into the `#root` div, while plain JavaScript writes the text via `document.getElementById`. The visualization source is minimal, focusing on React’s component mounting and DOM interaction rather than data-driven graphics. The starter setup includes an `index.html` entry point and a bundled JavaScript file, illustrating a basic React rendering workflow without external data or visualization libraries.