Hello world
A minimal React application renders a static smiley face as an SVG graphic. Using React and ReactDOM, the code defines a yellow circle with black stroke for the head, plus two smaller circles for eyes, all positioned within an 960 by 500 viewport. The SVG element includes an onClick handler that logs to the browser console when clicked, though no other interaction or animation is implemented. The example uses react@16.9.0 and react-dom@16.9.0 from the unpkg CDN.