This scatter plot visualizes the Iris dataset, mapping petal length on the x-axis and petal width on the y-axis, with each point colored by species (setosa, versicolor, or virginica) via a custom color function. The circles also encode sepal length and width as non-visual properties (rx and ry), though only a fixed radius is rendered. Built with D3 v6, the code loads CSV data using `d3.csv`, applies `scaleLinear` and `extent` for scaling, and renders axes via `axisLeft` and `axisBottom`. The SVG canvas fills the window, with a bottom margin accommodating custom axis labels for sepal length.