This example demonstrates a simple smiley face constructed entirely through D3.js v5 DOM manipulation. It uses `d3.select` and `.append` to create SVG circles and paths that form the face’s shape, eyes, pupils, tears, eyebrows, and mouth, with fixed coordinates and attributes set via `.attr`. The page loads D3 from a CDN and renders the face in a 960×500 SVG canvas, with static styling from a linked CSS file.