This example shows a simple yellow smiley face rendered as an SVG inside a React component. The face consists of a filled circle for the head, two black ellipses for eyes, and a smile created using the `d3.arc` path generator. The SVG is set to a fixed width of 960 pixels and height of 500 pixels, with the entire face group translated to the center. React 16.13.1 manages the component structure, while D3 v7 supplies the `arc` function to compute the smile path based on inner and outer radii and angular start/end points.