This example renders a yellow smiley face that fills the browser window, using React to generate an SVG graphic. The face is centered, with the head, two eyes, and a mouth positioned relative to the viewport's center and dimensions, while the stroke width and offsets are defined as constants. The code relies on React's `ReactDOM.render` and JSX to create the SVG elements, and the HTML file loads React from a CDN. The initial hardcoded SVG markup is hidden in the HTML, showing the shift to a dynamic, computed approach.