A yellow smiley face with animated eyebrows demonstrates basic SVG manipulation in D3.js. The code uses d3-selection to append circles and rectangles for the face, eyes, and brows, while a d3-shape arc creates the mouth. A chained transition moves the entire eyebrow group up and down in a continuous loop, altering its transform attribute over two-second intervals. The example relies on D3 v5 and SVG rendering.