This example loads a CSV of FBI NICS firearm background check data using `d3.csvParse` after fetching the file with the Fetch API. It displays the parsed data as raw JSON in a `<pre>` element, converting the numeric columns—handgun, long_gun, other, and multiple—to numbers with the unary plus operator. The visualization tracks loading state through a `setState` callback, initially showing `"LOADING"` before the data appears. The code relies on D3 v7 methods including `select`, `csvParse`, and `join` to render the output.