This example displays a single yellow circle with a black outline centered on a 900-by-500 SVG canvas. The circle is drawn directly in the SVG markup within the HTML page, using standard SVG `<circle>` elements with `cx`, `cy`, `r`, `fill`, `stroke`, and `stroke-width` attributes. No external JavaScript libraries or data sources are involved; the visualization is purely static and defined entirely in the raw `index.html` file.