A smiling face rendered in SVG features animated eyebrows that rise and fall in a repeating two-second cycle, while the rest of the facial elements remain static. Built with D3 v5, the example uses fundamental selections and DOM manipulation to construct circles, rectangles, and an arc-generated mouth. The code leverages d3.select, d3.arc, and chained transition calls to move the eyebrow group vertically, demonstrating core drawing and animation techniques in a minimal, self-contained visualization.