This example visualizes historical win-loss records for every NBA team, showing winning rates over time. The data is fetched as CSV and parsed with `d3.csvParse`. While loading, the state flag triggers a re-render; the code currently outputs the parsed data as raw JSON text in a `pre` element using `d3.select` and `.text()`. The visualization logic is scaffolded through a `viz` function that manages state transitions via a `setState` callback, with the fetch initiated when `state.data` is undefined.