This example shows a single yellow circle with a black outline, rendered at the center of a 960-by-500 pixel SVG canvas. It demonstrates a minimal React application that uses D3.js’s `svg` circle element to draw the shape, with explicit `cx`, `cy`, `r`, `fill`, `stroke`, and `stroke-width` attributes. The code calls `ReactDOM.render` to mount the component into the `#root` div, relying on the React and ReactDOM UMD libraries and D3 v5. No data source is used, as the visualization is purely static geometry.