A smiling face drawn with SVG shapes animates its eyebrows and mouth in a looping transition. The code builds the face using D3.js v5 selection and append methods to create circles, rectangles, lines, and an arc-based path, all positioned with hardcoded coordinates. The eyebrows shift upward and the mouth changes thickness through chained `transition().duration(3000)` calls, demonstrating basic DOM manipulation and attribute updating without data binding.