This example builds a smiling face out of basic SVG shapes using D3.js v5. The face consists of a yellow circle for the head, two circles for eyes, two rectangles for eyebrows, and an arc-generated path for the mouth, all centered within an SVG canvas. The eyebrows animate upward and then back down via chained `transition()` calls. The code imports `select` and `arc` from d3, demonstrating how to construct and position shapes with SVG attributes.