Smiley Face
A React application renders a simplified smiley face as a static SVG graphic. The face consists of a yellow circle with a black border, positioned at the center of a 960×500 viewport, and two smaller black circles representing eyes. Coordinates for the face and eyes are computed from width, height, and offset constants rather than loaded data. React 17 uses `ReactDOM.render` to mount the SVG elements defined in JSX, with styling applied directly through SVG presentation attributes.