This example shows a yellow smiley face centered on a full-screen SVG, with two black eyes and a rounded mouth hinted by the face’s stroke. The React component calculates dimensions from the window size and positions the face relative to the viewport center. It uses `React.createElement` indirectly via JSX, and renders SVG elements like `circle` with dynamic coordinates and radii. The code does not include a visible mouth path, so the smile is implied only by the lower face boundary. The rendering relies on ReactDOM to mount the component into the `#root` div, with no external data source.