Fork of Let's make a face with D3.js!
This animated D3.js example creates a smiley face from basic SVG shapes, with a yellow circle for the head, two eyes, and an arc-shaped mouth. The eyebrows, rendered as rectangles, move up and down in a continuous two-second loop using chained `transition` calls. The code demonstrates DOM manipulation by appending elements to an SVG canvas and applying transforms through D3's selection and attribute methods.