Fork of Let's make a face with D3.js!
This example builds a smiling face out of SVG shapes using D3.js v5, with a yellow circle for the head, two eyes, and an arc-based mouth. The code demonstrates fundamental DOM manipulation through selections and chained `transition` calls that animate the eyebrows upward and back down over two two-second intervals. Rendering is done entirely with SVG elements appended to a 960×500 canvas, using D3’s `select`, `append`, attribute setters, and the `arc` generator for the mouth path.