This example demonstrates a minimal React application that renders a smiley face using SVG circles, though the visible output currently shows a "hello world" heading. The code imports React and ReactDOM, creates a simple functional component, and mounts it to the root element. The SVG markup for the smiley face is present but commented out, leaving only the React-based text rendering active. The visualization uses React 16.9.0 from a CDN and renders through standard React DOM methods.