Let' make a face with D3.js
A cheerful cartoon face, centered on a yellow SVG circle, is assembled from simple geometric shapes and set in motion. The left and right eyes and rectangular eyebrows are positioned relative to the face’s center, and the entire eyebrow group animates upward and then back down over four seconds using chained `transition` calls on the D3 selection. A mouth is drawn as a semi-circular arc using the `arc` generator from D3’s shape utilities. The example uses D3 v5 with the React starter template, operating on SVG elements within a 960×500 viewport.