This example shows a single, full-page message reading “Hello HTML!” centered horizontally with a large font size. The page is constructed with a minimal HTML document that contains a div element styled through an embedded CSS rule. The styling sets the font size to 13em and uses text-align to center the text. No JavaScript executes in this page, and no external libraries or data sources are involved. The implementation relies solely on basic HTML tags and CSS properties to achieve the visual result.