This example demonstrates a minimal React and D3.js starter template for building SVG visualizations. It shows how to render an SVG canvas with a configurable margin layout and placeholder data structure containing four categorical values. The `VizContainer` component abstracts the SVG and group elements, following a margin convention that can be visually highlighted via a `showMargins` prop. The code uses ReactDOM for rendering, D3 v6 for data handling and selection, and references the ResponsiveWaffleHtml component from the @nivo/waffle library, though the actual chart is not rendered in the visible boilerplate output.