Let's make a face with D3.js!
This example shows a yellow smiley face drawn with SVG circles, rectangles, and an arc path, with animated eyebrows that rise and fall in a looping transition. The code uses D3.js v5 selections to append elements to an SVG canvas and `transition().duration()` to move the eyebrow group vertically. Using `d3.arc` for the mouth and fixed pixel offsets for features, it demonstrates fundamental DOM manipulation and chained transitions without external data.