This example demonstrates a minimal React application that renders the text “Hello React” to the browser. The code defines a simple `App` component returning a `<div>` element, then mounts it into the DOM via `ReactDOM.render` targeting the `#root` element. It uses the production UMD builds of React 17.0.2 and React-DOM loaded from unpkg, with the page styling hiding margins and overflow. No additional data or visualizations are present; the example focuses on the basic setup and rendering pipeline for a React-based visualization project.