A yellow smiley face built with SVG uses D3.js v5’s selection methods to append a circle for the head, two circles for eyes, and rectangles for eyebrows, with an arc-generated path forming the mouth. The code demonstrates chained transitions via `transition.attr` to animate the eyebrow group’s vertical position over two 2-second phases, creating a raising and lowering effect. The face is centered using a group transform, with all shapes positioned relative to that origin.