This example shows a smiley face rendered in SVG that scales to fill the browser window. The face is composed of a yellow circle with a black outline, two solid black eyes, and a nose, all positioned relative to the center of the viewport. The code uses React to create the SVG elements and ReactDOM to mount the component into the page. Key geometric values like eye offset, eye radius, and mouth radius are defined as constants, with the face’s radius based on the window height.