This example builds a simple cartoon face from SVG primitives using D3 v6. A yellow circle forms the head, two black circles serve as eyes, and a mouth is drawn as a path generated with the `d3.arc()` generator. The code selects the SVG element, reads its width and height attributes, and positions each shape relative to those dimensions. The arc’s inner and outer radii, along with start and end angles, define the mouth’s curved shape.