This pie chart displays the distribution of three Iris species in the classic dataset, with each slice labeled by species and a color-coded legend below. The visualization uses D3 v7’s `d3.pie` and `d3.arc` generators to compute slice paths, while `d3.rollup` aggregates row counts from a CSV loaded via `d3.csv`. SVG paths and text elements are rendered inside a centered group, with a separate HTML legend built from `d3.scaleOrdinal` color mapping.