This example displays the percentage of total sales for different items in a pie chart using D3 v5. The code loads CSV data from a GitHub gist and renders an SVG with a pie chart and a legend, with each slice and legend entry colored by a fixed ordinal scale. It uses `d3.csv`, `d3.pie`, and `d3.arc` to compute and draw the arc segments, and `d3.scaleOrdinal` for color mapping, while formatting the percentage labels with `d3.format`.