Lets make a face
A simple face is drawn entirely with SVG shapes in a 960-by-500 viewport, using a yellow circle for the head, two black circles for eyes, and a path generated by `d3.arc()` for the mouth. The code selects the SVG element with `d3.select` and sets each shape’s attributes—`r`, `cx`, `cy`, `fill`, and `stroke`—explicitly. The mouth is positioned relative to a `<g>` group translated to (250,200), and the arc spans from angle 0 to π. This example demonstrates basic SVG rendering with static D3 v5 selections, without data binding or interaction.