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This example uses D3.js to animate a smiley face’s eyebrows, demonstrating fundamental DOM manipulation with SVG. The code creates a yellow face with circles, eyes, and a mouth using an `arc` shape, then applies a repeated 2-second `transition().attr()` sequence to move the eyebrows vertically. The animation runs continuously, toggling the eyebrow position up and down. Rendered via D3’s SVG selection and attribute methods, it showcases chained transitions for simple, time-based visual effects.