This example shows a full-screen message reading “Hello HTML!” centered within the page, styled with a very large font size. It demonstrates the basic integration of CSS for visual formatting and JavaScript for potential interactivity, though the code itself contains no scripts. The page uses plain HTML elements and a style block to define the `.message` class, with no external libraries or data sources. It serves as a minimal template for understanding how HTML, CSS, and JavaScript can be combined in a simple, self-contained web page.