This example shows a smiling face built with React and D3, rendered as an SVG. The face consists of a yellow circle with a black stroke, two black eyes, and a mouth drawn using the `arc` helper from the `d3-shape` package. The mouth’s path is generated by configuring the arc’s inner and outer radii and start and end angles, then passing the result to an SVG path element. Grouping and positioning rely on SVG group elements with a transform attribute using ES6 template literals.