Smiley Face Part 1
A yellow circle with a black outline serves as the face, featuring two solid black eyes positioned symmetrically above the center and a thick, dark mouth arc drawn along the lower half. The example uses React to render the SVG elements and D3’s `arc` generator to construct the mouth path, with coordinates computed from fixed offsets and radii. The face is centered within a 960 by 500 viewport, and all shapes are defined declaratively as JSX components.