This example demonstrates fundamental DOM manipulation with D3.js by building an interactive smiley face whose eyebrows move in response to a data-driven simulation. It renders the face as SVG elements using `d3.select` and chained attribute setters, while the eyebrow motion relies on D3’s `transition.attrTween` to interpolate positions. The code loads D3 v5 from a CDN and integrates a JSON dataset containing vertices and edges, though the visible visualization focuses solely on the SVG face rather than the network data. The page uses a full-screen SVG canvas with a stylesheet that hides overflow.