This example renders a simple smiley face using React and SVG, drawing a yellow circle with two smaller black circles for eyes. The code uses React 17 and D3 v7 via UMD scripts from unpkg, with ReactDOM rendering the SVG elements into the DOM. The visualization demonstrates basic SVG shape attributes like `cx`, `cy`, `r`, and `stroke`, while CSS removes the body margin to display the graphic edge-to-edge. The static composition is defined entirely through JSX coordinates and radii.