This example shows a smiling face made of yellow circles with black outlines, rendered in a browser window. It uses the React library’s `ReactDOM.render` method to display SVG elements, with dimensions derived from `window.innerWidth` and `window.innerHeight`. The face consists of a large central circle, two eye circles, and placeholder markup for a mouth, all positioned via absolute coordinates and relative offsets. The code relies on React 16.9.0 and ReactDOM, drawing static SVG shapes without interaction or animation.