Smiley Face Part III
This example renders a stylized smiley face in SVG, combining React elements with D3’s `arc` generator to form the mouth. It draws yellow circular face, eyes, and black eyebrows via SVG lines, while using rectangles with drop shadow filters for the mouth ends and an ellipse with a radial gradient for the nose. The face is centered using a translation group, with all coordinates relative to the center, and relies on ReactDOM for mounting and D3 v5 for the arc path.