This example shows a stylized smiley face drawn in SVG, with a yellow circular head, black outline, two eyes, and a curved mouth. It is built as a React component that renders the face using D3’s `arc` generator to compute the mouth path and standard SVG circle elements for the head and eyes. The code relies on React 16.9 and D3 v5, with the `arc()` API configured with inner and outer radii and start/end angles to create the smile. All elements are centered within a 960×500 viewport.