SmileyFace
This example renders a simple smiley face as a static SVG graphic. The visualization shows a yellow circle with a black stroke as the face, two solid black circles for eyes, and no mouth, though the markup for a mouth is commented out. Built with React, the code defines an `App` component that returns a minimal `<h1>hello</h1>`, while the SVG elements are present only as commented-out JSX. React and ReactDOM are loaded via CDN, and the page mounts the component to a `root` div, though the current render does not display the face.