A smiling face rendered in SVG uses D3.js v5 to demonstrate fundamental DOM manipulation. The code selects an SVG element, appends a yellow circle for the face, and adds eyes, eyebrows, and a mouth using D3’s `arc()` generator. Two transitions animate the eyebrow group’s vertical position over two seconds each, moving them up and down. The example relies on D3’s `select` and `transition` methods to build and animate the static SVG structure.