This example renders a stylized, emoji-like face using React and D3’s `arc` generator. It shows a blue circle with a black stroke as the head, two offset circles as eyes, and a curved mouth path created from an arc with specified inner and outer radii and angles. The SVG is centered via a group translation, and the computed dimensions and offsets are defined as constants. The code imports React and `d3` from CDNs, uses React’s `ReactDOM.render` to mount the component, and relies on JSX curly braces for inline JavaScript expressions.