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This example uses D3 v7 to render a simple yellow smiley face on an SVG canvas. The code builds the face from basic shapes: a circle for the head, two circles for eyes, rectangles for eyebrows, and a path created with the `arc()` function for the mouth. An animation sequence, driven by chained `transition()` calls with a 2000-millisecond duration, moves the eyebrows down and back up. The underlying data is positional, defined by hard-coded constants like `eyeSpacing` and `eyeRadius`, directly set as SVG attributes through D3's selection and append methods.