A yellow smiley face with animated eyebrows is rendered in an SVG. The face is composed of D3.js shapes: a circle for the head, two circles for the eyes, and an arc for the mouth. The eyes' rect eyebrows repeatedly move up and down using chained D3 `transition` calls with a 2-second duration each. The code uses D3 v5's `select`, `append`, and `attr` functions to build the SVG DOM directly.