This example visualizes the cost of sales from 2000 to 2013 using a smooth area chart rendered with SVG. The visualization pairs a black curved line with a light green filled region beneath it to emphasize trends over time, with red tick labels and orange axis labels. It loads CSV data via `d3.csv`, parses year strings into `Date` objects, and applies `d3.scaleTime` and `d3.scaleLinear` for positioning. The line and area paths are generated with `d3.line` and `d3.area`, both using `curveBasis` for smoothing, while axes are created with `d3.axisBottom` and `d3.axisLeft`.