A yellow smiley face with black eyes and a curved mouth sits centered on a black background, while its rectangular eyebrows bounce up and down in a looping two-second animation. The example demonstrates fundamental DOM manipulation using D3.js v3, building the face from SVG shapes like circles, rectangles, and an arc path. The eyebrows move via chained `transition()` calls with a 2000-millisecond duration, toggling their vertical offset back and forth. All rendering is done through D3 selections and the `arc()` helper, with no external data source.