This example shows a partially completed smiley face constructed from basic SVG shapes. A large green circle with a blue border serves as the face, while two smaller black circles act as eyes. The code uses D3 v7’s `select` and `arc` APIs to append a mouth path, with the arc generator defining its inner and outer radii and start/end angles. The SVG canvas is set to 960 by 500 pixels, with hardcoded coordinates positioning the elements.