This example shows a smiley face rendered across the full browser window using React components for each SVG circle. The face consists of a yellow head, two black eyes, and a mouth, with all geometry computed from the window dimensions so the graphic scales responsively. The code uses React 16.9 and ReactDOM to render an SVG element, with inline style properties for sizing and positioning. No external data source is used; the visualization is purely procedural, drawing shapes based on hardcoded offsets and radius values.