A single SVG circle is drawn on a blank web page to demonstrate the fundamental structure of an SVG-based visualization. The example shows how to define an SVG container with the `<svg>` element and place a circle with explicit `cx`, `cy`, and `r` attributes for its center coordinates and radius. The page relies purely on the browser’s native SVG rendering, with no external JavaScript libraries or D3.js code involved. The source is a standalone HTML file that directly embeds the SVG markup.