A yellow smiley face drawn with SVG circles, rectangles, and an arc path animates its eyebrows in a looping transition. D3.js v5 selections append and style the facial elements, while `transition.attr` shifts the right eyebrow’s vertical position over 2-second intervals. The mouth uses the `d3.arc()` generator to create a curved path. Static attributes set the face radius, eye spacing, and eyebrow dimensions.