This example shows a smiling face composed of SVG primitives, built with React and D3. The face’s yellow circular background, two eyes, and an arc-shaped mouth are rendered inside a React SVG container, with each facial component defined as its own React component. D3’s `arc` API generates the mouth’s path geometry, while the background and eyes use plain SVG circle elements. The face’s dimensions, positions, and stroke widths are controlled by props passed to a central `Face` component.