This example draws a cheerful yellow face using SVG shapes, including circles for the eyes and an arc for the mouth. The eyebrows are rectangles that animate up and down via chained `transition()` calls with a 2000-millisecond duration. The code uses D3 v7, loaded from UNPKG, and imports `select` and `arc` from the `d3` module. All elements are centered within a 960x500 SVG using a group transformation.