This example combines a line chart and area chart to show Facebook’s annual users from 2008 to 2017. The line traces the trend of user growth, while the filled area underneath emphasizes the magnitude of the values over time. The visualization uses D3 v5 APIs including `d3.line`, `d3.area`, `d3.scaleLinear`, `d3.axisBottom`, and `d3.axisLeft`, with `curveBasis` for smooth curves. Data is loaded from a CSV file via `d3.csv`, and the SVG rendering applies custom styling for axes and labels.