This example demonstrates how React manages asynchronous data loading for a D3 visualization. It fetches a CSV file of CSS named colors using the `csv` utility from D3 v5, then displays summary statistics about the dataset—size in kilobytes, row count, and column count—in a simple text format. The React `useState` hook tracks the loaded data, while `useEffect` triggers the D3 fetch operation once on component mount. The `message` helper formats the statistics using `d3.csvFormat` to calculate byte length.