Hello HTML
A yellow circle with black outline forms a face, with two black eyes and a black mouth created as an arc path, all rendered inside an SVG. The example demonstrates a minimal React application using `d3.arc` to generate the mouth’s path data. The `ReactDOM.render` method mounts the SVG component, which uses D3’s arc generator to define the path geometry. The face is centered on a 960 by 500 canvas, with positions computed relative to the center.