Smiley Face part 1
A stylized smiley face is assembled from React components, with a yellow SVG circle for the head, two black circles for the eyes, and a mouth drawn using a d3.arc path. The face is centered in a 960 by 500 viewport, with the head’s radius and stroke-width defined in the code. The example demonstrates combining React’s component model with d3’s shape-generation API, using SVG for all rendering.