A yellow smiley face with animated eyebrows demonstrates fundamental D3.js DOM manipulation. The code uses `d3.select` to build SVG shapes—circles for the face and eyes, rectangles for eyebrows, and an `arc()` path for the mouth—positioned via SVG transforms. A chained `transition().duration()` sequence moves the eyebrow group up and down over two-second intervals, creating a repeating eyebrow raise. The example relies on D3 v5's selection and transition APIs, with all elements rendered directly into an inline SVG.