Fork of Let's make a face with D3.js!
A smiling face with yellow circular head, black-outlined eyes, and a curved mouth is rendered as SVG using D3 selections. The code builds the face by appending circles, rectangles, and an arc path to a centered group element. Eyebrows animate upward and back down via chained `transition.attr` calls over two-second intervals. The example uses `d3.select`, `d3.arc`, and SVG attribute manipulation to demonstrate fundamental DOM binding and transitions in D3 v5.