Smiley face part 1
This example constructs a stylized smiley face using SVG primitives with React. It shows a yellow circle with a black outline, two eyes, and a mouth arc, all positioned relative to a central point. The code uses React components to organize the drawing, while the mouth shape is generated with `d3.arc` from the d3 library. The visualization is rendered as SVG within a React component, following the v3 source data.