This example creates a yellow smiley face with eyes, eyebrows, and a smile using D3.js v5. The code builds the face with SVG circles, rectangles, and an arc path, then animates the eyebrows by repeatedly transitioning their vertical position over two-second intervals. It demonstrates fundamental DOM manipulation with selections and the `transition()` method, using `d3.select` and `d3.arc` to construct the shapes in a centered group.