This area chart displays monthly sales figures, using a filled path to emphasize the trend over time. Built with D3 v7, the visualization maps categorical month labels to the x-axis via `scalePoint` and a linear scale for sales values on the y-axis. The code fetches CSV data from a GitHub gist and renders the area with a steel-blue fill, adding labeled axes for clarity. The SVG output is generated programmatically through D3’s `area` generator and standard axis functions.