A yellow smiley face appears in an SVG, built entirely through D3.js v5 selections and DOM manipulation. The face includes a head, two eyes, and a mouth drawn with the `d3.arc()` path generator. The eyebrows, rendered as rectangles, animate continuously via chained `transition` calls, moving up and then back over 2-second intervals. The example demonstrates fundamental SVG element creation, coordinate transforms, and data-driven attribute updates using D3's `select`, `append`, and `attr` methods.