Fork of Smiley Face Part IV
This example shows a pink smiley face with purple outlines and a mouth rendered as an arc, built as a React component. The face is positioned at the center of an SVG canvas, with fixed eye offsets and a mouth arc created using D3’s `arc` generator. D3 v5 supplies the arc shape, while React (16.9) handles the declarative SVG elements, and the entire graphic is drawn using SVG markup.