A smiling face rendered in yellow with black outlines is drawn using SVG primitives within a React application. The face is composed of a large circle for the head, two smaller circles for the eyes, and a curved path for the mouth, all positioned relative to a central origin point. The React component uses D3's `arc` function to generate the mouth's path data, calculating its geometry mathematically rather than hard-coding coordinates. The SVG is displayed in a full-viewport HTML page that loads React, ReactDOM, and D3 from a CDN.