This example presents a minimal HTML page centered around a large "Hello HTML" message, styled with CSS at 13em font size. It shows a scalable SVG graphic with a radial gradient rectangle that transitions from white to black. The page uses an inline SVG with a defined `radialGradient` element and a JavaScript console log statement. The SVG `viewBox` and `rect` elements demonstrate basic vector rendering, while the script provides a simple debugging output for browser developer tools.