This example demonstrates how to load and parse CSV data using D3 v5 within a React framework. It fetches a dataset of CSS named colors from a GitHub gist and displays summary statistics—file size in kilobytes, row count, and column count—in a large HTML `<pre>` element. The primary implementation uses the `d3.csv` method, which returns a promise, while commented-out alternatives show the same task with `fetch` and `async`/`await` syntax, alongside `d3.csvParse` for manual parsing. The code also includes a commented “pyramid of doom” pattern for comparison.