A smiling face rendered as SVG shapes in D3.js v5 shows animated eyebrow movements. The code builds the face using `d3.select`, `d3.append`, and `d3.arc` to create a yellow circle head, two eyes, and a mouth. Eyebrows are rectangles that move up and down via chained `transition().duration()` calls, each lasting two seconds. The example demonstrates fundamental DOM manipulation with D3's imperative API, drawing all elements on a 960×500 SVG canvas.