Smiley face part 1
A yellow smiley face appears in an SVG, drawn with React components and D3's `arc` generator for the mouth. The face consists of three circles—a large yellow head with a black stroke, and two smaller eye circles—plus a partially drawn mouth arc. The code uses ReactDOM to render the SVG into the DOM, with D3 v7 providing the `arc` function to create the mouth path. The example demonstrates a static, programmatic composition rather than interactive data-driven behavior.