TRIAL PAGE
This example displays the text “Hello world!” in a plain HTML page, alongside a large, centered “Hello HTML!” message styled with CSS. It demonstrates a minimal integration of client-side JavaScript with the DOM, using the `textContent` property of the `document.getElementById` API to inject the message into a `<pre>` element. The page loads the compiled script from `bundle.js`, reflecting a React-based build setup, while the CSS class controls font size and alignment.