Fork of D3-1: Making a face
A cartoon face is rendered in SVG using D3 v7, with a yellow circular head, blue eyes, and a black-outlined arc for the mouth. The code builds the face by appending SVG elements via `d3.select`, `append`, and `attr`, and defines the mouth’s path using the `arc` generator from D3’s shape module. Both rectangular eyebrows animate up and down over four seconds using chained `transition().duration()` calls, showing how D3 handles simple sequential motion. No external data is used; the visualization is purely code-driven geometry.