This example builds a smiley face with D3.js v5, animating its eyebrows in a repeating up-and-down motion. The face is constructed entirely from SVG primitives—circles for the eyes, rectangles for the eyebrows, and a path generated with the `d3.arc()` API for the mouth—all grouped and positioned via `transform` attributes. The animation uses chained `transition().duration()` calls on the eyebrow group, while static styling is applied directly to attributes like `fill` and `stroke`. The code imports `select` and `arc` from D3 and renders to a fixed 960×500 SVG canvas.