This example displays a yellow smiley face built with SVG shapes, centered in a 960-by-500 viewport. It uses React to render the SVG elements and the D3 arc generator to create the mouth path with a specified inner and outer radius. The face consists of a large circle with a thick black stroke for the head, two smaller circles for eyes, and the arc-based mouth, all positioned using translation and D3’s arc function with start and end angles.