A smiling face drawn with SVG shapes—a yellow circle, black outlines, pink ellipses for cheeks and ears, and an arc for the mouth—has animated eyebrows that continuously move up and down. The example demonstrates fundamental DOM manipulation with D3.js v5, using `select`, `append`, and `attr` to build the face from primitive elements. A `transition` with a two-second duration moves the eyebrow group, while `arc` generates the mouth path. No external data is loaded; all geometry is hardcoded in `index.js`.