This example demonstrates a minimal integration of React and D3.js, displaying the text "Hello D3 & React" as a static message. The code uses React's `useRef` and `useEffect` hooks to manage a DOM reference, and D3's `select` function to set the text content of the referenced element. The application is rendered to the DOM via React DOM's `createRoot` and a root component. The example relies on an import map loading React 19, React DOM, and D3 v7 as JavaScript modules.