This example demonstrates asynchronous data loading in a React application with D3.js. It fetches a CSV file containing CSS named colors and computes a summary message displaying the file size in kilobytes, number of rows, and column count. The code uses React hooks such as `useState` and `useEffect` to manage the data state, while the `d3.csv` function retrieves the remote dataset and `d3.csvFormat` calculates its byte size. The result is rendered as plain text within a `<pre>` element, showing "Loading..." until the data arrives.