This example shows a pie chart of student math scores from a CSV dataset, with each slice labeled by its value and accompanied by a color-coded legend of results. The chart uses D3 v5 to fetch and parse the data via `d3.csv`, then generates SVG arcs with `d3.arc` and `d3.pie`, coloring slices with `d3.scaleOrdinal`. Labels are placed at arc centroids, and the legend lists each result with its corresponding value. The code applies a custom `d3.format` for tick labels and lays out all elements within an SVG canvas of fixed dimensions.