This example shows a smiley face rendered as a scalable vector graphic using React and D3. The face is composed of a yellow circle for the head, two black eyes, and a curved mouth drawn as an arc path. The code uses React to create SVG elements and the `d3.arc` function to generate the mouth shape, with coordinates centered on the middle of the canvas. React 17 and D3 v7 are loaded via CDN, and the SVG is drawn with fixed dimensions of 960 by 500 pixels.