A yellow smiley face, drawn with SVG circles and an arc path, demonstrates basic D3.js DOM manipulation. The face’s rectangular eyebrows animate by moving up and down through two chained `transition().duration(2000)` calls on a group element. The code uses `d3.select`, `d3.arc`, and `d3.transition` from D3 v5 to build and animate the static face, with no external data source.