This example shows a smiley face rendered as an SVG, with a yellow circular head, two black eyes, and a curved mouth. Built using React and D3 v5, it imports the `arc` function from D3 to generate the mouth’s path. The head and eyes are plain SVG circles positioned with React JSX, while the mouth arc uses D3’s `arc()` with specified inner and outer radii and angle ranges. The entire drawing is centered and scaled to a 960 by 500 viewport, with a fixed stroke width for the head’s outline.