Face
A smiling face drawn with SVG shapes animates its eyes and eyebrows. The yellow circle head contains two black eye circles and rectangular brows that rise and fall via chained transitions, while a mouth arc uses the `d3.arc` helper. The code selects the SVG element, centers a group, and applies `transition.attr` with specified durations to move facial features vertically, demonstrating coordinate transforms and timed animations with D3 v5.