This example shows a yellow smiley face with eyes, eyebrows, and a mouth, built using D3.js v5. The face elements are drawn as SVG shapes, with the mouth created using the `arc` function. The eyebrows, rendered as rectangles, animate vertically through chained `transition` calls, moving up and then returning to their original position over two seconds. The code uses D3 selections and attribute manipulation to construct and transform the visual components.