A yellow smiley face is drawn in the center of an SVG canvas, with two black eyes and a thick black arc for a mouth, all scaled relative to the viewport dimensions. The example builds the shape using React’s declarative `circle` elements and a `path` generated by the `arc()` function from `d3-shape`, with the mouth’s start and end angles set to form a half-circle. Coordinates for the face’s features are computed from fixed width and height constants, and the entire group is translated to the canvas midpoint.