This example creates a simple animated face using SVG shapes and CSS styling. The face consists of a yellow circle with black stroke, two eyes, eyebrows, and a mouth path drawn with the `arc` function. The eyebrows animate up and down using D3’s `transition` method over two-second intervals. The code uses D3 v6 selections and SVG attributes to position elements relative to the center of the 960x500 canvas, with a standalone HTML page linking to a stylesheet and bundled JavaScript.