Smiley face using D3
A smiley face rendered in SVG uses D3.js to demonstrate fundamental DOM manipulation, with animated eyebrows that move up and down. The code draws yellow circles for the face and eyes, rectangles for eyebrows, and an arc-generated mouth, all positioned via D3 selections and transforms. A transition chain animates the eyebrow group’s vertical position over four one-second intervals, showcasing repeated attribute updates. The example relies on D3 v5’s `select`, `arc`, and `transition` APIs within a static SVG container.