This example renders a simple cartoon face using React and SVG. It shows a yellow circle for the head, two black circles for eyes, and a curved path for a frowning mouth, all centered on the canvas. The face is constructed programmatically with D3's `arc()` API to generate the mouth arc, while the head and eyes are drawn using standard SVG `<circle>` elements. The code uses React to define the SVG structure and D3 v7 for the arc geometry, with the entire composition transformed to the center of the 960×500 viewport.