This example builds a smiley face in SVG using D3.js v5, constructing the head, eyes, eyebrows, and mouth from geometric primitives like `circle`, `rect`, and `d3.arc`. The face is centered via SVG transforms, with the eyebrows animated upward and back down using chained `transition().duration(2000)` calls on a group element. No external data is loaded; the visualization focuses on programmatic DOM manipulation and declarative animation within an SVG canvas.