This area chart visualizes the cost of sales from 2000 to 2013, plotting yearly values as a smooth curved line with a light green filled region beneath it. The chart uses D3 v5 with SVG rendering, employing `scaleTime` for the x-axis, `scaleLinear` for the y-axis, and `area()` with `curveBasis` to generate the filled path. Data is loaded from a CSV file via `d3.csv`, with year values parsed as dates and costs converted to numbers. Axis labels and tick formatting are customized, including red tick text and an orange axis label.