This example shows a yellow smiley face rendered across the full browser window, with black-outlined circular eyes and a blank area where a mouth would be, as defined by the commented-out SVG. It uses React and ReactDOM to create SVG elements dynamically, calculating the face’s dimensions from `window.innerWidth` and `window.innerHeight`. The face is centered via a `<g>` transform, with stroke width, eye offsets, and radii set as JavaScript constants. The code renders a static composition without animation or interaction, relying on SVG’s `<circle>` elements.