Fork of Smiley Face Part II
This example shows a smiley face rendered as an SVG graphic using React and D3. The face consists of a yellow circle with a black stroke, two black eye circles, a red nose, and a curved mouth path. The `arc()` function from D3 defines the mouth's shape with specified start and end angles. React structures the SVG elements, while D3's arc generator creates the path data for the smile.