A yellow smiley face with blue pupils is drawn on a full-screen SVG, centered in the browser window. The face uses React components to render circles for the eyes and a D3 arc generator to create the mouth, while a yellow rectangle serves as the base. D3’s `arc` and React’s `ReactDOM.render` are the key APIs, with the figure’s geometry defined by fixed offsets and radii. The example demonstrates combining React’s declarative structure with D3’s shape utilities for SVG rendering.