This example shows a stylized smiley face rendered as an SVG, composed of a yellow circle background, two black eyes, and an arc-shaped mouth. The face is built from modular React components, including `BackgroundCircle`, `Eyes`, and `Mouth`, which are split into separate ES6 module files. The `Mouth` component uses the `d3.arc()` API to generate a path for the smile, while React Fragments allow the `Eyes` component to return multiple sibling circles without extra DOM nodes. All elements are positioned and scaled through React props, with the final SVG drawn inside a React-rendered `<g>` container.