This example demonstrates a minimal React and D3.js starter project for SVG visualizations. It shows a simple SVG canvas with a light gray background, a darker gray border, and a single red circle in the top-left corner. The code defines a reusable `VizContainer` component that handles the standard margin convention, translating the inner coordinate system and optionally displaying the margin boundaries. It uses CDN-loaded React, ReactDOM, and D3, with dimensions and margins set as variables, and renders the visualization through the `ReactDOM.render` API.