This example demonstrates how to construct a simple cartoon face using D3.js v7 with SVG rendering. It draws a yellow circular head, two black eyes, and an arc-shaped mouth using basic shape primitives and the `d3.arc` generator. The face is assembled by appending SVG circles and a path to an SVG canvas, with the mouth’s arc defined by inner and outer radii and start/end angles. Positional attributes like `cx`, `cy`, and `r` are set explicitly, while a group element applies a translation transform to center the head.