A fork of an area chart example, this visualization displays the cost of sales from 2000 to 2013 using D3 version 5. The SVG rendering uses `d3.area` and `d3.line` with a basis curve to create a smoothed area chart, with axes labeled using `d3.axisBottom` and `d3.axisLeft`. Data is loaded from a CSV file containing monthly website visitors, with the year parsed as a date and cost as a number. The chart employs red tick text, orange axis labels, and a light green fill for the area.