This example displays a large, centered message reading “Hello HTML!” using a plain HTML document with embedded CSS and JavaScript. The page’s single visual element is a styled `<div>` whose font size is set to 13em via the `.message` class, aligning it horizontally with `text-align: center`. The code demonstrates basic web rendering through standard HTML markup and CSS styling, with no external libraries or data sources. It serves as a minimal starter template for understanding how HTML and CSS work together to present static text content in a browser.