A minimal SVG rendering of a smiley face, centered within a yellow circle on a black stroke. Built with React and D3 v5, the code uses `select` to target the SVG, `arc` to generate the mouth path, and direct attribute chaining with `.attr` to position the eyes and body. The face is drawn via appended SVG elements—circle nodes for the eyes and face, and a path for the mouth—calculated from the viewport dimensions.