A yellow smiley face with black outlines, eyes, and eyebrows is drawn in SVG, and its rectangular eyebrows animate upward and back down over two seconds each way. The example demonstrates fundamental D3.js DOM manipulation by selecting the SVG, appending a centered group, and building the face with circles and rectangles. The eyebrows’ motion uses chained `transition` calls to tween the group’s `transform` attribute, while the mouth is created with the `d3.arc` path generator.