A yellow smiley face is drawn in SVG using D3.js v5, with two circles for eyes and a path-based arc for the mouth. The eyebrows, rendered as rectangles, animate upward and then back down over four seconds via chained `transition().duration()` calls. D3's `select` and `arc` utilities construct the face geometry, while a centered `<g>` group applies translations based on the SVG's dimensions.