This example showcases the capabilities of VizHub by loading D3 via UNPKG and using ES6 modules. It demonstrates data transformation with D3's `csvParse`, `flatRollup`, and `sum` functions on the classic Iris dataset. The visualization aggregates the data by species, calculating the average sepal length for each, and renders the resulting summary as formatted JSON text in a `pre` element. The code illustrates a pattern for fetching and parsing local CSV data asynchronously.