This example visualizes the classic Iris dataset as a scatter plot of sepal length against petal length, with points colored by shape according to species. It uses a D3 v7 ordinal scale with `symbolsFill` to assign distinct shapes to each species, and includes a custom shape legend generated with D3’s `symbol` generator. The axes are rendered via D3’s `axisLeft` and `axisBottom`, while the data is loaded asynchronously from a CSV file and parsed with `csvParse`. The visualization adapts to the full browser window size.