A yellow smiley face is drawn in SVG using D3.js v5, with circular eyes, rectangular eyebrows, and an arc-based mouth. The face’s eyebrows and mouth animate over two-second transitions, moving upward and downward repeatedly. The code selects the SVG element, appends groups for positioning, and uses D3’s `arc()` generator to shape the mouth, while `transition().duration()` drives the timed movements.