A scatter plot displays the Iris dataset, mapping petal length and width to the x and y axes. Points are colored by species (setosa, versicolor, virginica) using a custom color function. The visualization is built with D3 v6, using `scaleLinear` for axes, `extent` for domains, and `axisLeft`/`axisBottom` for tick marks, rendered as SVG circles within an HTML page. Data is loaded from a CSV URL.