A combined line and area chart displays Facebook's annual user counts from 2008 to 2017. The visualization renders an SVG using D3 v5, drawing a black line with the `line()` generator and a pink filled area beneath it using `area()`, both smoothed with `curveBasis`. The axes are created with `axisLeft` and `axisBottom`, with the x-axis representing years and the y-axis labeled "accidents" from the CSV data. The y-axis tick labels are formatted using D3's `format` function.