A donut chart visualizes 2022 U.S. auto sales by brand, with each arc’s size proportional to year-to-date sales and a color-coded legend showing brand names and values in thousands. The visualization loads CSV data from a Gist URL using `d3.csv`, calculates the total, and renders the chart with D3 v5’s `pie`, `arc`, `scaleOrdinal`, and `select` APIs. SVG output is drawn to a 960×500 canvas with interactive text and rectangle legends styled via CSS.