A yellow face with blue stroke, green eyes, brown eyebrows, a black nose, and an open mouth animates on a pink background. The eyebrows and mouth move up and down in a looping transition. Built with D3 v5, the example uses SVG elements and D3's `transition()` method to animate the brow group and mouth path. The face is constructed via `d3.select` and `d3.arc` for the mouth.