A cartoon face built with D3.js draws a yellow circular head, eyes, and eyebrows on an SVG canvas. The code uses `d3.arc` to generate the mouth path and `d3.select` to manage elements. A `transition` with `.attr` animates the eyebrow group vertically in a looping up-and-down motion. The fixed layout positions features relative to the SVG’s center, with all styling applied via inline attributes.