Fork of Smiley Face Part II
A smiling face is rendered as an SVG graphic, composed of a yellow circle for the head, two layered eyes with green irises and dark pupils, and a mouth drawn as an arc. The example demonstrates using React to manage the component structure while leveraging D3's `arc` function to generate the mouth path. All visual elements are positioned with absolute coordinates and rendered through React's declarative JSX syntax, integrating D3 calculations within the React component.