This example demonstrates asynchronous data loading in a React application using D3. It fetches a CSV file containing CSS named colors and displays the file size in kilobytes once the data arrives, showing a "loading" message beforehand. The code uses React hooks (`useState`) to manage the data state and the `csv` function from D3 to parse the remote CSV. The text updates dynamically through React's rendering, with the data size calculated using `d3.csvFormat`.