This example renders an animated emoji face using D3 v5 within a minimal HTML page. A yellow circle forms the head, with two eyes and a mouth drawn using SVG shapes and D3’s `arc` generator. The eyebrows animate vertically through chained `transition` calls on a group element, moving up and then back down over four seconds. The code imports `select` and `arc` from D3, sets SVG dimensions from attributes, and applies styling via an external CSS file that removes page margins.