This example uses React to render a smiley face as an SVG graphic. The application calculates the circle positions for the face, eyes, and head using constants derived from the window height and a fixed width, dynamically sizing the SVG to fit the browser viewport. The code imports React and ReactDOM to define an `App` component that outputs SVG elements, including `circle` tags, with properties for center coordinates, radius, fill, and stroke. The head uses a yellow fill with a black stroke, while the eyes are solid black circles positioned symmetrically around the face’s center. The rendering is handled entirely through React’s declarative component model, with the `ReactDOM.render` method inserting the SVG into the page’s root element.