This example draws a simple cartoon face from basic SVG shapes using D3.js v5. The code builds a yellow circle for the face, two black circles for eyes, and a mouth created with the `d3.arc` API, all positioned within an SVG canvas. The face is constructed procedurally using D3 selections to append elements, with SVG attributes controlling size and placement. No external data is used, making it a purely illustrative demonstration of D3's shape generation and coordinate-based rendering.