A simple, animated face built with D3.js v5 appears on a blank SVG canvas. The code draws a large yellow circle for the head, adds two eyes and rectangular eyebrows, and constructs a mouth using the `d3.arc()` generator. The eyebrows animate through a two-stage `transition().duration(2000)` sequence, moving down and back up. The example demonstrates basic SVG shape creation, attribute manipulation, and chained transitions, with dimensions calculated from the container's width and height.