Let's make a face with D3
A static SVG face is drawn from a single black line, with a yellow-filled path rendered by D3's selection and `select` API. The example demonstrates basic SVG coordinate plotting and styling, using `d3.select` to target the `<svg>` element and D3 v6 to append or manipulate shape elements. The page includes minimal styling from `styles.css`, such as a monospace font and highlighted text in red, while the visualization itself shows only a simple diagonal line and empty path, serving as a starting point for interactive face-building with D3.