A sad-faced emoticon rendered in SVG animates its eyebrows in a repeating cycle. D3 v7 selects the SVG element and constructs the face from circles, rectangles, and an arc-generated mouth. The code loads D3 via UNPKG and uses `select` and `arc` from the library. A `transition` with a two-second duration moves the eyebrows down and back up, creating the emotional expression.