This example creates a smiley face using D3.js v5, showing fundamental DOM manipulation with SVG shapes like circles, rectangles, and paths. The face's eyebrows animate by moving vertically and returning, using D3's `transition().duration()` to tween the `transform` attribute over two seconds. A yellow rectangle serves as the face, while the arc-based mouth uses D3's `arc()` generator for its path. The code directly selects and appends SVG elements, demonstrating basic D3 selection and attribute setting.