This example renders a yellow smiley face in an SVG canvas using React and D3 v5. It shows a circle with a thick black stroke, two small eye circles, and a mouth path generated by D3’s `arc()` generator with defined inner and outer radii and angular range. The face is centered via a translated `<g>` element, and its dimensions are computed from fixed width and height constants. React’s `ReactDOM.render` inserts the SVG into the DOM, while D3’s `arc` defines the mouth’s shape.