A yellow smiley face is drawn with two eyes and a curved mouth, and its eyebrows animate by moving upward and then back down in a loop. The example demonstrates fundamental D3.js v5 DOM manipulation using SVG elements like `circle`, `rect`, and `path`. The code uses `select` and `arc` from D3, and the animation is driven by chained `transition().duration(2000)` calls that alter the `transform` attribute on the eyebrow group.