This example demonstrates a simple data-loading workflow using React and D3. It fetches a CSV file of CSS named colors from a GitHub repository using the `d3.csv` function, then renders a vertical list of color swatches, one for each row. Before the data arrives, the interface shows a “Loading...” message. The `Message.js` utility calculates and returns a summary string with file size, row count, and column count, though it is not displayed here. The visualization relies on React’s `useState` and `useEffect` hooks to manage the asynchronous data fetch.