A yellow smiley face is drawn in SVG, and its eyebrows animate upward and downward in a looping motion. The face is built entirely through D3.js v5 selections, appending circles for the eyes and a path created with the `arc` generator for the mouth. Eyebrow movement is driven by chained `transition().duration()` calls that alternate the eyebrow group’s vertical translation. The code imports `select` and `arc` from D3 and positions all elements relative to the SVG’s center.