A yellow smiley face with animated eyebrows demonstrates D3.js DOM manipulation. The face, built with SVG circles and an arc path for the mouth, uses D3 selections to append elements and set attributes. Eyebrows are rectangles that move via `transition().attr()` in a looping duration sequence. The example leverages D3 v5, importing `select` and `arc` from the main module, and renders entirely in SVG within a fixed-width viewport.