This example displays a plain text message, “Hello World!”, inside an HTML `<pre>` element on a webpage. It demonstrates a minimal React setup using a static HTML file and a bundled JavaScript file. The `index.js` file selects the element with `document.getElementById` and updates its `textContent` property to display the message. The page loads the script via a `script` tag pointing to `bundle.js`, showing a basic data-free rendering approach with vanilla JavaScript.