This example demonstrates fundamental DOM manipulation with D3.js by constructing a smiley face from SVG shapes, including a yellow circle head, eyes, a line nose, and an arc mouth. The code animates the eyebrows using chained `transition().duration()` calls, moving them upward and back down over two seconds. It uses D3 v5’s `select` to target the SVG element and `arc` to generate the mouth path, with all elements appended to a centered group. The rendering relies entirely on SVG and animation, with no external data source.