Let'd make a face with D3.js!
A yellow SVG face built with D3 v5 displays a simple smiley with two eyes, animated eyebrows, and a curved mouth. The code draws the face using SVG shapes such as circles, a rect, and a path generated with the `d3.arc()` helper. Transitions animate the eyebrows by shifting their vertical position over two seconds, while the mouth delays before changing its radius. The face is centered within a 960×500 SVG canvas using a transform, with static features defined by constants for spacing and dimensions.