This example shows a smiley face drawn with SVG shapes, centered in a yellow circle with a black outline, two eyes, and a mouth formed by an arc. It uses React components to structure the SVG, with D3’s `arc` generator creating the mouth path based on inner and outer radii and start/end angles. The code defines fixed dimensions for the canvas, eye offsets, and radii, then renders the scene through `ReactDOM.render` into the root element.