This example shows browser usage statistics for January 2017 as a donut chart, with each slice labeled by browser name and colored via a categorical scale. The visualization uses D3 v4’s `d3.pie` and `d3.arc` to generate the arc paths, and `d3.scaleOrdinal` for the color mapping. Data from the local CSV file `lottery.csv` is loaded with `d3.csv`, and the chart is rendered as SVG within a React-compatible HTML page. The title appears as static text, while slice labels are positioned using `label.centroid`.