Let's make a face with D3.js!
This example uses D3.js to draw a simple, smiling face entirely from SVG primitives. A yellow circle forms the head, two smaller black circles serve as eyes, and two rectangles act as eyebrows. The mouth is created using D3's `arc` generator, which defines a path with a specified inner and outer radius and angular range. The code positions all elements relative to a central `g` group, using D3’s `select` and `append` methods to build the SVG structure.