This example shows a yellow smiley face built with React and D3’s `arc` generator, rendered as SVG. The face uses a yellow background circle with a black stroke, two fixed eye circles, and a mouth drawn as an arc path defined by inner/outer radii and start/end angles. React components manage the SVG elements, while D3’s `arc()` computes the mouth’s path geometry. The code explicitly sets the face dimensions, eye offsets, and mouth radius, but does not include any interaction or animation.