SVG Fundamentals
This example demonstrates the foundational layers of SVG-based data visualization with a minimal HTML page. It uses CSS and JavaScript to render a large, centered text message directly in the browser. The page combines an HTML `style` block that sets the font size to 13em with the `.message` class, and a plain `div` element containing the greeting "Hello HTML!". The code highlights the essential structure of an SVG-capable document, though it does not yet include any SVG elements or data-driven graphics.