This fork uses D3.js (v7) to render a pie chart of regional sales. It loads a CSV file from a GitHub gist containing sales data, aggregates sales by region using `d3.rollup` and `d3.sum`, and displays the result as a pie chart with `d3.pie` and `d3.arc` functions. Each slice is labeled with its region and sales amount, and the chart is rendered as SVG with colors from `d3.schemeCategory10`.