Fork of Smiley Face Part II
A smiley face is rendered as a scalable vector graphic, centered on a yellow circle with black outlines, two eyes, and a curved mouth. The visualization is built with React and D3, using D3’s `arc` generator to create the mouth path and SVG circle elements for the face and eyes. The SVG canvas fills the browser window, and coordinates are calculated from the viewport dimensions. The code imports React, ReactDOM, and `arc` from D3, demonstrating a straightforward combination of React’s component structure with D3’s shape-generation utilities.