This example shows a smiley face composed of a yellow circular background, two eyes, and a mouth, all rendered as SVG elements within a React application. The face is centered using an SVG `<g>` transform, with a fixed viewport of 960 by 500 pixels. The code uses React components for each facial feature, with the mouth generated using the D3 `arc` function to create a curved path. The visualization relies on React for component structure and D3’s geometry utilities for the mouth’s shape, using D3 v5.