A smiling face rendered in SVG, drawn with D3.js v5 shapes including circles for the face and eyes, rectangles for the eyebrows, and a path for the mouth. The code uses `select` and `append` to build the DOM, while `transition` animates the eyebrows upward and back downward over two-second intervals. The example demonstrates fundamental D3.js DOM manipulation and animation, with the face centered via an SVG `g` transform.