This example displays a scatter plot of the Iris dataset, mapping sepal length on the x-axis against petal length on the y-axis. Points are colored and shaped according to species, with a legend indicating the mapping. The visualization is built using D3 version 7, leveraging the `scaleLinear`, `scaleOrdinal`, `symbol`, and `symbolsFill` APIs for scales and glyphs, along with custom axis and legend modules. Data is loaded from a remote CSV file and parsed with `csvParse`.