This example displays a single yellow circle on a gray background, rendered as an SVG element. The circle is positioned at the center of a 960 by 500 canvas using React’s declarative syntax. The code defines the circle’s coordinates and radius as JavaScript variables, then passes them to an SVG `<circle>` element within a React component. The visualization is built with React 16.9 and ReactDOM, which render the SVG directly into the HTML page.