Let's make a face with D3.js!
A yellow smiley face is drawn with D3.js, featuring two eyes, a curved mouth, and animated eyebrows that move up and down in a looping transition. The visualization demonstrates fundamental DOM manipulation by appending and transforming SVG shapes (`circle`, `rect`, `path`) within grouped elements (`g`), using D3 v5’s selection and transition APIs. The face is centered via a translated group, and the mouth is generated with D3’s `arc` shape helper, while the eyebrow motion relies on chained `.transition().duration()` calls.