A smiley face drawn with SVG elements demonstrates fundamental DOM manipulation and animation with D3.js v5. The face features a yellow circle, two eyes, and a mouth created using the `arc` generator, while the eyebrows animate upward and downward via chained `transition` calls. The code uses `select` and `append` to build the SVG structure, and CSS hover and active states change the face's fill color. The example focuses on showing how D3 can construct and transform visual elements through data-independent selection methods.