A yellow smiley face with animated eyebrows demonstrates fundamental DOM manipulation in D3.js. The face is drawn using SVG shapes, including a circle for the head, eyes, rectangular eyebrows, and a mouth path created with the `d3.arc` helper. The eyebrows move upward and downward through chained `transition().duration(2000)` calls, altering their vertical translation. The example uses D3 v5 selections to append and style SVG elements within a centered group, illustrating basic data-driven document updates without external datasets.