This example renders a classic yellow smiley face using D3 v7 and React. It constructs the face from SVG shapes, with a large yellow circle for the head, white eye regions with brown pupils, and D3 arc paths for the mouth and nose. The `d3.arc` API defines the mouth and eye-lash arcs using inner and outer radii with start and end angles. The composition is centered on a 960 by 500 canvas, and the code explicitly uses React's `ReactDOM.render` to mount the component.