A yellow smiley face rendered in SVG demonstrates D3.js DOM manipulation and animation. The code appends circles for the eyes, red nose, and arc-generated mouth, while rectangles serve as eyebrows that move via chained `transition.attr` calls over two-second intervals. Using `d3.select` and `d3.arc`, it builds the face from static shapes then animates the eyebrow group’s transform, showing basic enter-append and transition patterns with D3 v5.