This example shows a smiling face rendered as an SVG in a React component, featuring two eyes and a complete circular mouth created with D3’s `arc()` generator. The code uses ReactDOM to mount the component into the page, while D3 v5 provides the arc path for the smile. The face is drawn with hard-coded coordinates, including a yellow circle with a black stroke, positioned eyes, and a mouth path, all inside a static SVG with fixed dimensions.