Let's make a face with D3.js!
This example shows a yellow smiley face built with D3.js v5, complete with eyes, eyebrows, and a curved mouth, rendered as SVG elements. The code uses D3 selections and the `arc` generator to construct the face, then animates the eyebrows by chaining `transition().duration()` calls to move them up and down. Each facial feature is positioned using SVG attributes like `cx`, `r`, and `transform`, with the mouth drawn via the `arc()` path helper. The face is centered on a 960×500 canvas using a translated group element.