A smiling face composed of SVG shapes is rendered with a yellow circle for the head, two black circles for eyes, and a black arc for the mouth. Built with React and D3 v7, the example uses the `arc()` generator from d3 to define the mouth’s curved path, while a reusable `Face` component handles the head. The SVG is centered and scaled based on fixed width and height values, with ReactDOM rendering the final composition.