This example displays a simple yellow smiley face drawn with SVG circles, rendered through React. It uses React 17 and D3 v7 loaded via UMD builds from unpkg, with ReactDOM rendering the SVG elements directly. The code defines constants for layout dimensions and styles, demonstrating how to mix JSX with JavaScript expressions using curly braces to position the face’s eyes and outer circle. The visualization serves as a minimal starter template for integrating React and D3 in a web page.