A yellow smiley face is drawn with SVG shapes, and its eyebrows animate up and down in a looping motion. The example demonstrates fundamental D3.js DOM manipulation by appending circles, rectangles, and an arc-generated mouth to an SVG canvas. It uses the `d3.select` and `d3.arc` APIs, along with chained `transition().duration()` calls to animate the eyebrow group's transform. The code imports from D3 v5 and renders entirely with SVG elements on a 960 by 500 canvas.