This example shows a simple, full-window smiley face rendered as a scalable vector graphic. The face is built from a large yellow circle with a black outline, two smaller black circles for eyes, and a mouth implied through a missing arc, all composed using React’s declarative syntax. The code uses React and ReactDOM to create an SVG element, with dimensions and positions computed from the browser window’s `innerWidth` and `innerHeight`. The rendering relies on SVG’s circle elements in a translated coordinate system, and the approach is purely programmatic, using no external data source.