A React and SVG implementation renders a full-screen smiley face, centering the graphic within the browser window using `window.innerWidth` and `window.innerHeight`. The face consists of a yellow circle with a black stroke, two black eye circles positioned via offset coordinates, and a mouth drawn with a stroke arc. The code computes dimensions dynamically and uses JSX with ReactDOM to mount the SVG onto the page, demonstrating a straightforward component-based approach to vector graphics.