This example renders a full-screen smiley face using React and SVG. The face is centered dynamically based on the window dimensions, with a yellow circular head, two black eyes, and a black outline. The code constructs the visualization with React elements for SVG circles, using `window.innerWidth` and `window.innerHeight` to set the canvas size. ReactDOM renders the component into the DOM, while the stroke and fill attributes define the face’s appearance. The implementation relies on React 16.9 and produces the graphic entirely through declarative SVG markup.