A yellow smiley face with animated eyebrows demonstrates fundamental DOM manipulation with D3.js. The code selects an SVG element and builds the face using basic shapes, including circles for the eyes and a path generated with the `d3.arc` function for the mouth. Eyebrows are rectangle elements that move up and down using chained `transition` calls, each lasting three seconds. The example relies on D3 v5’s `select`, `arc`, and transition methods, rendering in SVG with only a script and stylesheet, without external data sources.