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This example renders a simple smiley face as an SVG graphic using React and D3. It displays a yellow circle with a black stroke, two black eye circles, and an open mouth created with D3’s `arc` generator. The drawing is positioned via a transformed `<g>` element at the center of a 960×500 viewport, with hardcoded coordinates for the eyes and mouth. React manages the component structure, while D3 v7 computes the arc path geometry. The page loads React 17, ReactDOM, and D3 from CDN scripts and mounts to a root div.