A yellow circle with a black outline forms a face, complete with two eyes, animated eyebrows, and a curved mouth drawn using D3's `arc` generator. Eyebrow rectangles transition vertically via chained `transition().duration()` calls, moving down and back up over two seconds each way. The SVG is centered using a `g` element translated to the middle of a 960×500 viewport, with all shapes positioned relative to that origin. The example uses D3 v5, importing `select` and `arc` from the library.