This example displays historical average winning percentages for NBA teams, computed from a CSV dataset and rendered as a JSON array. The visualization uses D3 v7’s `flatRollup` and `sum` functions to aggregate win percentages per team across all seasons. After fetching the data via a URL, `csvParse` converts the CSV string into objects. The computed results are output as formatted text inside a `<pre>` element, demonstrating a straightforward data-transformation pipeline without additional chart rendering.