This example uses React and ReactDOM to render a simple “Hello JSX” heading inside a full-screen HTML page. The code imports React and ReactDOM, logs both to the console, defines a functional component returning JSX, and mounts it to the root div. While the title suggests a smiley face, the visible implementation only displays the text, with no drawing or animation logic present. The page loads React 16.9.0 from unpkg and has no data source or external visualization library.