A yellow smiley face with animated eyebrows demonstrates basic DOM manipulation and transitions in D3.js v5. The SVG face is built from circles, rectangles, and an arc-generated mouth, centered by translating a group element. D3’s `transition().duration()` shifts the eyebrow group upward and back down in a two-second loop. The code imports `select` and `arc` from the D3 module, using method chaining to append and style each shape.