This example shows a yellow smiley face rendered as an SVG using React components and D3’s arc generator. The face is drawn with a large circle for the head, two smaller circles for the eyes, and a mouth path created by `d3.arc` with specified inner and outer radii and start/end angles. The SVG is centered via a group translation, and all dimensions are computed from fixed width and height constants. The code uses React’s `ReactDOM.render` to mount the SVG into the DOM, with D3 v5 providing the arc shape and React 16.9 managing the component structure.