This example draws a smiling face using SVG shapes built with D3.js selections and the `d3.arc` path generator for the mouth. A yellow circle forms the head, with two dark eyes and rectangular eyebrows positioned via coordinate offsets. The eyebrows animate upward and back down over four seconds using chained `transition` calls with `attr` updates on the group’s transform. All elements are centered by translating a parent `<g>` based on the SVG’s dimensions, demonstrating fundamental DOM manipulation and data-driven styling without external data or force simulation.