Fork of Hello HTML
This example builds a yellow smiley face using React to render SVG elements, with D3’s `arc` generator creating the mouth path. The face is centered via a `<g>` transform, while hard-coded constants control eye offset, radius, and stroke width. The code imports React, ReactDOM, and the `arc` function from D3 v7, and renders the final SVG into a root div. The static composition demonstrates geometric primitives—circles and a path—without interaction or data binding.