This area chart shows global video game sales per year for the top six platforms (Wii, X360, PS, DS, PS2, PS3), with each platform’s total sales labeled at its peak. The visualization uses D3 v7 with SVG rendering and loads CSV data from a GitHub gist, aggregating sales via `d3.rollups` and `d3.sum`. Areas are drawn with `d3.area` and a monotone X curve, while axes and legends are generated using `d3.axisBottom`, `d3.axisLeft`, and custom legend groups.