This example shows a smiley face rendered as SVG, with a yellow circle for the head, two dark eyes, and a smile drawn as a thick arc. The visualization demonstrates how to combine React for component structure with D3’s `arc` generator for the mouth path. The `arc()` is configured with inner and outer radii, start and end angles, and outputs a `path` element. All shapes are positioned using SVG coordinates, and the face is centered via a `g` transform. The code uses React 16.9 and D3 v5, both loaded from CDNs, with the final SVG drawn declaratively inside the React component.