This example builds a yellow smiley face with D3.js and animates its eyebrows upward in a repeating two-second cycle. The code uses `d3.select`, `d3.arc` for the mouth path, and chained `transition` calls to move the eyebrow group’s `transform` attribute. Circles form the eyes and a yellow circle with a black stroke forms the head, all rendered in SVG. The animation demonstrates basic DOM manipulation and timed transitions with D3 v5.