This example displays the text “Hello HTML” in a large, centered font on a blank page. It demonstrates the basic structure of an HTML document combining embedded CSS and JavaScript. The CSS sets the body’s text alignment and font size, while the JavaScript uses the browser’s `console.log` API to output “Hello JavaScript!” and “Hello D3.js” to the developer tools. The page does not use any external libraries or data, serving as a minimal template for static web content.