This example renders a green smiley face with two eyes, a mouth, and simple facial features using React and D3 v5. It shows how to combine React components with D3’s `arc` generator to draw the mouth path, while circles and ellipses create the eyes and face outline. The SVG is centered on a 960x500 canvas, with all elements positioned relative to a central transform. The code demonstrates a minimal setup where React handles the DOM rendering and D3 provides shape generation, using a static, hardcoded design with no data sources.