This scatter plot visualizes the Iris dataset, showing the relationship between petal length and petal width, with each point colored by species (setosa, versicolor, or virginica) using a custom marker function. The visualization, rendered as an SVG using D3 v6, loads data from a remote CSV file via `d3.csv`, scales axes with `scaleLinear` and `extent`, and draws circles with attributes mapped from sepal measurements. Axis labels are added via `axisLeft` and `axisBottom`, and text elements are rotated to label the y-axis.