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This example demonstrates a simple smiley face rendered as a static SVG using React and D3. It shows a yellow circle with a black outline, two black eyes, and a curved mouth drawn with the D3 `arc` generator. React defines the component tree, while `ReactDOM.render` mounts it to the DOM. The SVG uses a centered group with translated coordinates, and all shapes are positioned relative to the center point. The code hardcodes dimensions and style values, with no interactive or animated behavior.