A smiling face composed of simple geometric shapes is rendered in an SVG canvas. A large yellow circle forms the head, with two smaller black circles for eyes and a dark arc for the mouth, all centered within a 960 by 500 pixel space. The example uses D3 version 7 to select the SVG element and append the shapes, with the mouth drawn via the `d3.arc` API, which constructs a path based on specified inner and outer radii and angular ranges.