This example displays a stylized smiley face composed of SVG shapes centered on a 960-by-500 canvas. It shows a circular face with a horizontal gradient fill and stroked outline, two khaki eyes, and a khaki mouth shaped using a D3 arc path. The visualization is built with React 17 and D3 v7, using D3’s `arc` generator to define the mouth’s inner and outer radii and angular span, while React renders the SVG elements declaratively.