A yellow smiley face with animated eyebrows demonstrates fundamental DOM manipulation with D3.js. The face is drawn using SVG elements, including circles for the head and eyes, rectangles for eyebrows, and an arc-based path for the mouth. Eyebrows animate upward and downward through chained `transition()` calls with a two-second duration each. The code uses D3 v5 and imports `select` and `arc` directly. All elements are centered within an SVG via a translate transform.