This example shows a yellow smiley face rendered as an SVG, with two black eyes and a curved mouth, centered on a 960 by 500 canvas. Built with React and D3 v5, the face uses `d3.arc()` to generate the mouth path, while circles for the face and eyes are defined with JSX inside the SVG. The code sets explicit positions and radii for each visual element, with the face drawn using simple SVG primitives and a transform to center the group.