Smiley face part I
This example shows a simple smiley face drawn with SVG shapes, including a yellow circular face, two red eyes, and a white mouth, all outlined in black. The face is centered and scaled within an 960×500 viewport. The implementation uses React to render the SVG elements and D3 v7’s `arc` generator to create the curved paths for the eyes and mouth, with parameters for radii, angles, and offsets defining the geometry.