A smiling face drawn with SVG shapes responds to a looping animated transition: the eyebrows move upward, hold, then return. The example demonstrates fundamental D3.js DOM manipulation, building the face from a yellow circle, two dark eyes, rectangular eyebrows, and a smile-shaped path generated with the `d3.arc()` function. D3.js v5 selects the SVG element, appends groups for coordinated positioning, and uses `transition().duration(2000)` to animate the eyebrow group's vertical offset. All elements are styled directly via attributes like `fill` and `stroke` within an 960×500 SVG canvas.