Fork of Smiley Face Part II
A React-rendered SVG smiley face fills the browser window, centered with a yellow circular head, black stroke, two offset eyes, and a curved mouth path. The example demonstrates integrating D3's `arc()` generator with React components, using JSX to position circles and a path element. It imports `arc` from d3.v7, computes dimensions dynamically from `window.innerWidth` and `innerHeight`, and renders via `ReactDOM.render` into a root div. The code shows a static visualization without interaction or data binding, purely illustrating geometric composition through declarative React markup combined with D3 shape utilities.