This example draws a cartoon cat face using D3.js v7 and SVG. The code constructs a gray head circle, ears, eyes, nose, mouth, and whiskers by chaining selection methods like `append` and `attr` on a centered group element. It uses `d3.select` to access the SVG, computes the center from its width and height attributes, and builds the whiskers with a `for` loop that appends multiple `line` elements. All shapes are positioned with explicit coordinates relative to the group's transform.