This example uses D3 v7 to draw a simple yellow smiley face in an SVG canvas. It demonstrates basic shape creation and positioning, using `d3.select` to target the SVG element and `d3.arc` to generate the mouth path with specified inner and outer radii and angles. Circles are appended for the face and eyes with fixed radii and coordinates, while the mouth is placed in a translated group. The code shows how to compose SVG primitives with D3’s selection and path-generation APIs.