A smiling yellow face rendered in SVG uses circles for the eyes and head, rectangles for animated eyebrows, and a path for the mouth. The eyebrows move via chained D3.js transitions, shifting their vertical position over two seconds and then snapping back. The example demonstrates fundamental DOM manipulation using D3.js v5’s `select` and `append` functions, with coordinates calculated from the SVG’s dimensions. The animation runs automatically on page load.