A yellow smiley face with moving eyebrows demonstrates D3.js v5 DOM manipulation. The code builds the face using SVG shapes, appending a circle for the head, two circles for eyes, rectangular eyebrows, and a path generated with the `arc()` function for the mouth. The eyebrows animate upward and downward over two seconds using chained `transition()` and `attr()` methods. This example highlights fundamental D3 selection, attribute setting, and transition functionality.