A simple smiley face rendered with React and D3, using SVG shapes such as circles and a path. The face shows two black eyes and a curved mouth, defined with the D3 `arc` generator. The yellow face and blue stroke are drawn via React's JSX, while D3's `arc()` computes the mouth path. The example demonstrates a minimal React component structure with fixed dimensions and no interactivity, relying on static SVG elements positioned relative to the center of the canvas.