This example demonstrates asynchronous data loading in D3 v7. It fetches a CSV file containing 500 records from NYC OpenData’s Motor Vehicle Collisions – Vehicles dataset, filtered to sedans. The visualization initially shows a loading state, then parses the CSV with `d3.csvParse` and converts the UNIQUE_ID field to numeric values using a `for` loop. The processed data is stored in a state object and displayed as a JSON-formatted text preview inside a `<pre>` element via `d3.select` and `.text()`.