Hello HTML
This example renders a stylized smiley face using React and SVG, with D3’s `arc()` helper generating the mouth path. The face is centered via a translated `<g>` group, and features yellow circular head, white eyes with black pupils, eyebrows, and a nose line, all drawn as primitive SVG elements. React manages the component structure, while D3 v5 provides the arc geometry. The code defines fixed constants for dimensions and offsets, demonstrating a minimal integration of React with D3 for static, declarative SVG visualization.