Smiley Face Part One
This example shows a static smiley face built with React and D3, rendered as an SVG. A yellow circle forms the head, with two black circles for eyes and an arc-shaped mouth created using the D3 `arc()` generator. The code uses React to define the SVG elements and D3 v6 for the arc path, with coordinates calculated relative to the center of the 960×500 canvas. The face is drawn without animation or interaction, focusing on the geometry of the shapes.