A simple SVG face with two black eyes and a yellow circular head appears on a red-bordered canvas. Using D3.js v6, the code draws an arc below the face to represent a mouth, whose curvature continuously widens and narrows via `d3.timer`. The arc’s start and end angles are recalculated each frame based on elapsed time, and the path’s `d` attribute is updated through the `d3.arc` generator. Static elements are defined directly in HTML, while the animated mouth is appended programmatically.