This example shows a simple smiley face rendered as a full-screen SVG, with a yellow circular head, two black eye circles, and no mouth. The face is centered using a translation group, and its size scales to the browser window’s dimensions. It uses React and ReactDOM to create and mount the SVG elements, with coordinates and radii calculated from `window.innerWidth` and `window.innerHeight`. The code defines constant offsets for the eyes and stroke styling for the face outline, demonstrating basic geometric composition in a React-based visualization.