This example demonstrates a playful SVG smiley face constructed entirely through D3.js v5 DOM manipulation. The face features animated eyebrows that move up and down using chained `transition().duration()` calls, a mouth drawn with the `d3.arc()` path generator, and CSS-styled elements like ears, teeth, and a headband. The code uses `select`, `arc`, and `attr` to build the face on an SVG canvas, with HTML divs layered for additional facial features. The animation runs automatically in a loop, showing the eyebrows shifting repeatedly between raised and resting positions.