This example shows a scatter plot of the Iris dataset, plotting sepal length against petal length with points shaped by species. It uses D3 v7 modules including `d3.scaleLinear`, `d3.scaleOrdinal`, `d3.symbol` with `symbolsFill` for shape encoding, and custom `axes` and `shapeLegend` functions. Data is fetched as CSV from a GitHub repository and parsed with `d3.csvParse`. The visualization updates responsively to the window size, with a legend positioned at a fixed coordinate.