This example displays a yellow smiley face with black-outlined eyes and a curved mouth, rendered as SVG within a React component. The face is built from arcs and circles, positioned relative to a central coordinate system. The code combines React 16.9 with D3 v5, using the d3.arc API to generate the mouth path and a reusable BackgroundCircle component for the face’s outer shape. Dimensions and offsets are static constants, and the SVG is rendered directly into the DOM via ReactDOM.