SVG and CSS
This example renders a smiley face as a static SVG graphic using D3 v6. It draws a yellow circle for the head, two black circles for the eyes, and a semicircular arc for the mouth via the `d3.arc()` helper. The dimensions come from the SVG’s width and height attributes, and a `<g>` element translates to the center for the mouth path. All shapes are positioned manually without data binding, and styling is handled through D3’s attribute chaining.