This example visualizes a simple smiley face that scales responsively to fill the browser window. The face is drawn using React with SVG, featuring a yellow circle for the head, two black eyes, and a mouth that is defined but not rendered. The code calculates the center and dimensions based on `window.innerWidth` and `window.innerHeight`, then uses ReactDOM to render the SVG into the page. The stroke width and eye offsets are hardcoded, creating a minimal, functional demonstration of vector graphics in a React application.