This example shows a yellow smiley face composed of SVG shapes, with the head, eyes, and mouth positioned relative to a central point. It combines React for declarative component rendering with D3’s `arc` generator to create the smile path, using a custom inner and outer radius with specified start and end angles. The SVG is rendered via ReactDOM into a root element, while D3 v5 provides the geometric calculations. The face uses hardcoded dimensions and colors, demonstrating a straightforward integration of D3’s arc API within a React component.