A smiling face is drawn using D3.js v5 with SVG shapes, including a yellow circle for the head, eyes, eyebrows, and a mouth created with the `arc` generator. The eyebrows animate upward and back down over four seconds using chained `transition` and `attr` methods. The code demonstrates fundamental DOM manipulation by selecting the SVG, appending groups, and positioning elements via translation transforms. All coordinates and dimensions are computed from the SVG's width and height attributes.