This example demonstrates how to load external data with D3 utilities and manage it through React state. The application fetches a CSV file containing CSS named colors from a GitHub gist using d3.csv, then displays a summary message showing the data size in kilobytes, row count, and column count. The visualization uses React hooks—useState, useEffect, and useCallback—to handle asynchronous data loading and rendering. The output is rendered as SVG-like text within a pre element, with d3.csvFormat used to calculate the formatted data length.