A minimal D3 tutorial example renders a cartoon face in SVG, with a yellow circle head, eyes, and a smile drawn via the `d3.arc` path generator. The code uses D3 v6 selections to append elements, and demonstrates `transition` with chained `.duration()` calls to animate the eyebrows up and down repeatedly. The React-free setup loads D3 from a CDN in an HTML page, with the styling applied through external CSS that hides page margins and overflow.