A cheerful cartoon face built from SVG shapes appears, with eyes, animated eyebrows, and a smile. The eyebrows continuously slide down and back up using chained D3 transitions. The example demonstrates composing geometric primitives—circles, rectangles, and an arc-based mouth—within a centered group, all rendered in clean SVG. It uses D3 v5's selection and arc APIs, with React as the surrounding framework and JavaScript handling the animation.