A yellow SVG face with animated eyebrows demonstrates basic D3 v5 shape and transition APIs. The code uses `d3.select`, `d3.arc`, and chained `transition().duration()` calls to move the brow rectangles up and down over two seconds. Eyes and brows are positioned with explicit `attr` values for spacing and offsets, while the mouth is drawn as a half-arc path. The face is centered by translating a group element to the middle of the 960×500 SVG canvas.