Fork of Let's make a face with D3.js!
A yellow smiley face appears centered in an SVG canvas, built entirely with D3.js v5 shape and selection APIs. The code uses `d3.arc` to draw the mouth, while circles form the eyes and rectangles create the eyebrows. Two chained `transition()` calls animate the eyebrow group upward and then back to its original position over four seconds, demonstrating basic DOM manipulation and animation through D3’s data join and transition system.