This example renders a cartoon face using D3 v5 within a React framework. The face consists of a yellow circle with eyes, eyebrows, and a mouth, all drawn as SVG shapes. The eyebrows and mouth animate repeatedly through transitions, alternating between raised and lowered positions. The code directly uses D3’s `select`, `arc`, and `transition` methods, with the mouth’s shape changing via arc path updates and the eyebrows moving via `attr` transitions.