This example demonstrates a bare-bones starter template for combining React with D3.js. It shows a simple layout with gray and light-gray rectangles representing the SVG canvas and the inner plotting area, separated by visible margins. The code uses React’s `createElement` pattern and a reusable `VizContainer` component that abstracts standard margin conventions and renders an SVG `<g>` group. D3 v6 is loaded via CDN, and the setup uses ReactDOM to mount the visualization, with the margin rectangles toggled by a `showMargins` prop.