A yellow circle with black outlines forms a simple face, complete with eyes, eyebrows, and a mouth. The eyebrows animate by moving up and down repeatedly over two-second transitions. Built with D3 v5, the example uses `d3.select`, `d3.arc` for the mouth path, and SVG elements like circles and rectangles. The rendering is SVG-based with animation handled through chained `transition().duration()` calls.