A yellow smiley face with moving eyebrows demonstrates basic SVG manipulation and animation with D3.js. The face is drawn using D3 selection methods to append circles for the eyes, rectangles for the eyebrows, and a path generated with the `d3.arc` function for the mouth. Eyebrow movement is created using chained `transition` calls that alternate the vertical translation of the eyebrow group over two-second intervals. The code imports specific functions like `select` and `arc` from the D3 v5 library and renders entirely as SVG within a fixed-size viewport.