This example builds a cheerful yellow smiley face using D3.js v5, rendered as SVG elements. The face is composed of circles for the head and eyes, rectangles for eyebrows, and an arc-generated path for the mouth. The code demonstrates fundamental DOM manipulation with `d3.select` and `d3.append`, while `d3.arc` creates the mouth shape. An animation driven by chained `transition` and `attr` methods moves the eyebrows up and down over a four-second cycle, showcasing how D3 transitions can animate SVG attributes.