This example renders a stylized smiling face in an SVG canvas using D3 v5. The visualization animates the eyebrows in a looping vertical motion via chained `transition().duration()` calls. The face is constructed with basic shapes: a yellow circle for the head, two circles for eyes, rectangles for eyebrows, and a D3 `arc()` path for the mouth. The code reads the SVG dimensions directly from the DOM attributes to position elements around a central group.