This example uses React and ReactDOM to render a full-screen, scalable vector graphic (SVG) of a smiley face. The face is drawn with a large yellow circle for the head, two smaller black circles for the eyes, and a mouth, all positioned relative to the window’s center using SVG `circle` elements and a `transform` group. The code calculates the radii and offsets based on the viewport dimensions, and the `stroke-width` attribute outlines the head. The visualization fills the entire browser window, with the SVG's width and height set to the window’s inner dimensions.