This example renders a classic smiley face using React and SVG. It shows a yellow circular background, two black eyes, and a curved mouth, all centered on a canvas with a vertical black line. The code uses React components for each facial feature, with the mouth drawn using the d3.arc() API to create a precise arc path. The SVG is generated with React’s JSX syntax, and the d3.js library is loaded via CDN, with the visualization updating declaratively through React’s rendering.