This example shows a stylized smiley face built from basic SVG shapes in a React component. It uses a yellow circle with a thick black stroke for the head, two black circles for eyes, and a curved mouth generated with the D3 `arc` generator. The React app renders the SVG directly to the DOM via `ReactDOM.render`, while D3.js provides the `arc()` function to create the mouth path. The visualization demonstrates how React manages SVG elements and how D3’s geometric utilities can be integrated into a React rendering pipeline.