This example demonstrates fundamental DOM manipulation with D3.js by building a smiley face whose eyebrows animate. The visualization loads population data from a CSV file using `d3.csv`, though the data itself does not drive the face’s rendering. The face is drawn entirely with SVG elements selected and appended via `d3.select` and standard DOM methods. The eyebrows move through D3’s selection and transition APIs, highlighting how D3 can directly manipulate existing SVG nodes without data joins or scales. The page uses D3 v5 and renders all graphics in a single SVG container.