A yellow smiley face, rendered as SVG primitives, appears centered on a dark background. D3.js code appends a circle, eyes, eyebrows, and a mouth path created with the `arc` function. The animation uses chained `transition().duration()` calls to move the eyebrows down and back up over two seconds, demonstrating fundamental DOM manipulation. The example uses d3.v5 with the `select` and `append` APIs to build the figure.