A smiling yellow face rendered in SVG is built from geometric primitives using D3 selections, with animated eyebrows that repeatedly raise and lower. The code constructs circles for eyes, rectangles for brows, and a path generated by the `d3.arc` API for the mouth, all grouped and positioned via SVG transforms. The eyebrow animation uses chained `transition().duration()` calls to toggle the y-offset between states. The example relies on D3 v5 and vanilla SVG.