This example demonstrates a minimal React application that renders a single yellow circle with a black border on an SVG canvas. The circle is centered within a 960 by 500 pixel viewport using hardcoded coordinates. The code imports React and ReactDOM, defines a functional component that returns SVG markup, and mounts it to the root DOM element using `ReactDOM.render`. It loads React and ReactDOM from CDN UMD builds, with the component code transpiled into `bundle.js`.