This example shows a yellow smiley face rendered in SVG with animated eyebrows that move up and down. D3.js creates the face using circles for the eyes, rectangles for the eyebrows, and an arc path for the mouth, all positioned within a central group. The animation uses chained transitions on the eyebrows group, alternating between two vertical offsets over two-second intervals. The code imports `select` and `arc` from d3 and uses an SVG container sized 960 by 500 pixels.