This example uses D3.js version 5 to build an animated face from basic SVG shapes. A yellow circle forms the head, with two smaller circles for eyes, and a custom arc path renders the mouth. The eyebrows, drawn as rectangles, perform a repeated vertical transition to simulate a winking or expressive motion. The code leverages D3’s `select`, `arc`, and chained `transition().duration()` methods, while React and a bundled `bundle.js` handle the application structure. All coordinates and sizes are derived from the SVG’s width and height attributes.