This example builds a simple cartoon face from SVG shapes, including a yellow circular head, eyes, eyebrows, and a mouth. The face is centered within the viewport using a translated group element. The eyebrows animate upward and back down using chained `transition.duration` calls on a group’s transform attribute. The code leverages D3 v5’s `select` and `arc` helpers, the latter generating the mouth path from inner and outer radii and angular extents. Static shapes are drawn with circles and rectangles appended to SVG groups.