This example renders a smiley face using React and D3.js version 6, drawing SVG shapes onto a 960-by-500 canvas. The face consists of a yellow circle with a black stroke for the head, two dark circles for eyes, and a mouth created with D3’s `arc` helper, which defines an annular sector path with specified inner radius, outer radius, and angle range. The React component computes layout constants such as center coordinates, eye offsets, and mouth dimensions, then applies a transform to center the group. The rendering uses static SVG elements without interaction or animation.