Let's make a face with D3.js
A yellow circular face with black-outlined eyes and animated eyebrows is rendered in SVG using D3.js. The face is built from D3 selections and shape generators, including `d3.arc` for the mouth path. Eyebrows transition vertically using `transition.attr` with a 2000-millisecond duration, creating a repeated raising motion. The example demonstrates basic D3 data binding, SVG shape construction, and animation chaining on a static, hardcoded dataset.