A smiley face rendered as a yellow circle with black stroke, two solid black eyes, and an arc-shaped mouth. The SVG is built with React components, using D3’s `arc()` generator to construct the mouth path. Dimensions and positions are derived from constants, with the face centered in a 960 by 500 viewport. D3 v7 and React 17 are loaded via UMD scripts, and the visualization uses declarative JSX to define circles and the path element.