This example renders a single yellow circle at the center of an SVG canvas using React. The circle’s position is computed from fixed width and height constants, and its radius is set to 30 pixels. The code uses React 16.9 via UMD builds, with ReactDOM rendering the SVG element into a root div. The implementation includes a commented-out full smiley face drawing, but the active code only displays the circle, and mouse movement events are left empty.