This example demonstrates asynchronous data loading in a D3.js visualization. The code fetches a CSV file containing the classic Iris flower dataset, parses it, and displays the raw JSON-formatted data prominently as the primary output. The visualization progresses through distinct states—starting with undefined, transitioning to a "LOADING" message, and finally populating with the parsed array of objects. It uses D3's `select`, `join`, `csvParse`, and a state management pattern with `setState` to control the rendering and handle the fetch-and-parse pipeline.