Smiley Face Part 4
This example shows a yellow smiley face rendered as an SVG, composed of a circular head, two eyes, and a curved mouth. The face is built using React components and D3’s `arc` generator to define the mouth path, with the head and eyes as simple SVG circles. All elements are positioned relative to the center of a 960×500 viewport, with stroke styling applied to the outer circle. The code uses React’s `createElement` and `ReactDOM.render` to mount the visualization, while D3 v5 provides the arc shape calculation.