This example shows a yellow smiley face rendered across the full browser window using React and SVG. The face consists of a large yellow circle with a black stroke for the head, two smaller circles for eyes, and a mouth that is currently missing from the code. The rendering uses React 16.9 to create and update the SVG elements dynamically, with dimensions and positions calculated from the window size and centered via a transform. The code relies on ReactDOM to mount the component into the page.