This example shows a smiley face rendered as an SVG using React and D3.js. The face is composed of a yellow background circle with a black stroke, two black eye circles, and a mouth drawn as an arc path. The code uses D3’s `arc` generator to define the mouth’s inner and outer radii and angular span, while React components structure the SVG elements. All shapes are centered and transformed via SVG groups, with dimensions and offsets stored as constants.