This scatter plot visualizes flower measurements from an iris dataset, plotting petal width against sepal length with points colored by species (setosa in white, versicolor in red, and virginica in yellow). The visualization uses d3’s `scaleLinear`, `axisLeft`, `axisBottom`, and `extent` APIs to compute scales and axes, while circles are appended via d3’s selection join mechanism. The underlying data is fetched as CSV from a GitHub gist, and the plot is rendered as an SVG that fills the browser window, with species-specific coloring applied to each data point.