This visualization demonstrates a blank SVG canvas with visible margin boundaries, ready for React and D3.js content. The `VizContainer` component abstracts the SVG and group elements, following the standard margin convention by translating the inner group. The code uses `ReactDOM.render` to mount the app, and shows the outer and inner rectangles as gray and light gray fills when `showMargins` is true. The example uses CDN-loaded React, ReactDOM, and D3 v6 libraries, with dimensions and margins defined as variables.