A smiling face built with SVG shapes demonstrates fundamental DOM manipulation using D3.js v5. The code constructs a yellow circle head, two eyes, and a mouth arc using the `d3.select`, `d3.arc`, and `d3.transition` APIs. The eyebrows, drawn as rectangles, animate vertically via chained `transition().duration()` calls, moving up and then back down over 2.8 seconds. All elements are positioned relative to the SVG's center using `transform` attributes.