D3Tuto-HelloViz
This example renders a yellow smiling face in SVG using React and D3. It uses D3’s `arc()` generator to create the mouth path, with specified start and end angles, while the eyes and face are drawn as simple SVG circles. The entire face is rotated 180 degrees within a `<g>` transform. The visualization is static, with no animation or interaction, and reads data directly from hardcoded coordinates and dimensions defined in the JavaScript code.