A yellow smiley face rendered as an SVG using React components, with a large circular head and two smaller circles for eyes positioned symmetrically around the center. The example demonstrates basic SVG circle elements and React’s declarative rendering approach, where the `<App />` component defines the scene with hardcoded dimensions and style properties. It uses ReactDOM to mount the component into an HTML page, relying on React 16.9 and ReactDOM 16.7 loaded via CDN. The code highlights how static SVG shapes can be composed programmatically with JavaScript variables for layout.