This example demonstrates a minimal React application that renders the text "Hello React!" onto a blank, full-screen HTML page. It shows how React DOM mounts a functional component into the DOM through the `ReactDOM.render` method. The code uses the React 17 and ReactDOM 17 libraries loaded via UMD scripts, with the component defined using JSX. The visualization serves as a starting point for building more complex data-driven interfaces, with no data source or rendering technique beyond basic DOM manipulation.