Let's make a face with D3.js!
A smiley face rendered in SVG with D3.js v5 demonstrates basic DOM manipulation and animation. The code uses D3's `select`, `append`, and `attr` methods to construct a face from circles, rectangles, and a path, with the mouth created using the `arc` function. Eyebrows animate by chaining `.transition().duration(2000)` calls to move their containing group vertically. The entire face is centered within a 960x500 SVG canvas using a translated group element.