Hello HTML
This example shows a simple smiley face drawn with SVG shapes, including a yellow circle, two black eyes, and an arc for the mouth. It uses React to render the SVG elements and d3’s `arc` function to generate the mouth path. The face is centered with computed coordinates, and the code applies fixed offsets and radii to position the eyes and mouth. The page loads React, ReactDOM, and d3 from CDNs, then mounts the React component into a root div. The description omits any data source, relying entirely on hard-coded dimensions and constants.