This example renders a simple smiley face as an SVG graphic. It draws a yellow circle for the head, two black circles for the eyes, and a half-arc path for the mouth, all positioned using the SVG `width` and `height` attributes. The code uses D3 v6’s `select`, `arc`, and `append` APIs to create and transform the shapes, with the mouth arc defined by inner and outer radii and start/end angles.