This example visualizes the Iris dataset, plotting petal length and width for individual flowers, with each species (setosa, versicolor, virginica) assigned a distinct color (blue, red, black). It uses D3 v6 to fetch the CSV data via `d3.csv`, then maps the values to screen coordinates using `d3.scaleLinear` and `d3.extent`. Circles are rendered with an SVG `join` operation, and axes are added with `d3.axisLeft` and `d3.axisBottom`. The plot fills the browser window, leveraging a full-screen SVG canvas.