This example shows a simple, hand-coded SVG face composed of a yellow circle, two eyes, and an arc-shaped mouth. The face is rendered inside a React component using JSX, with the mouth path generated by the `arc()` generator from d3-shape. The page loads React 17 and D3 v7 via CDN, then mounts the component into a root div, producing a static, frameless visualization at 960 by 500 pixels.