A smiley face drawn with D3.js shifts its expression to anger as its eyebrows animate downward, using a bouncing transition sequence. The SVG graphic features a red circle, two eyes, thick black eyebrow lines, and a curved mouth, all positioned with computed transforms. The code imports `select` and `arc` from D3 v5, though the mouth is actually a custom path, and animates the eyebrow group's vertical position with chained `transition().duration()` calls. The background is styled via inline SVG attributes and a separate CSS file.