A static smiley face fills the browser window, centered and sized to the viewport’s width and height. The face comprises a yellow circle with a thick black stroke, two small black eyes, and a curved mouth implied by the circle’s lower edge. The example demonstrates React’s declarative approach to SVG rendering, using ReactDOM to mount a component that directly outputs SVG elements like `<circle>` and `<g>` with transforms, without any dynamic interaction or mouse tracking.