The example shows a React application that loads and renders CSS named colors from a CSV file as a vertical stack of 4-pixel-tall color swatches. It uses the `useState` and `useEffect` hooks to asynchronously fetch the data with `d3.csv`, then maps each row to a styled `div` element whose background color is set from the `RGB hex value` column. The code also includes a separate plain D3 version that parses the same CSV and reports its size, row count, and column count using `d3.csvParse` and `d3.csvFormat`.