This example shows a minimal HTML page that displays the text "Hello HTML" centered at a very large font size. It demonstrates the fundamental structure of a web document by separating content, presentation, and behavior into HTML, CSS, and JavaScript. The styling uses a CSS rule on the `body` element for centering and font sizing, while a script tag logs "Hello JavaScript!" to the browser console. The page uses no external libraries, only native browser APIs for styling and console output.