A smiling face made of SVG circles and a path renders at the center of a 960×500 viewport, with a yellow background circle outlined in black, two offset black eyes, and an arc-shaped mouth. The example combines React 17 with D3 v6, using a custom `arc` generator from D3 for the mouth path while passing layout constants like `eyeOffsetX` and `mouthRadius` as React props. The face is grouped and translated to the canvas midpoint, and the background circle derives its radius from the vertical center minus half the stroke width.