This example shows the top 10 countries by deaths from air pollution in 2020 using a pie chart, with each slice labeled with the death count in thousands and a legend listing country names and values. The code fetches CSV data from a GitHub gist, parses it with the `csv` method from d3-fetch, and renders the chart as SVG. It uses `d3.pie`, `d3.arc`, `d3.scaleOrdinal`, and `d3.format` to compute, draw, color, and label the segments, while legend items are appended as groups with rectangles and text elements.