This example displays the Iris dataset as a bubble chart, plotting sepal width on the x-axis and petal width on the y-axis. Circle size encodes sepal length, while color distinguishes species (setosa, virginica, versicolor) via a scaleOrdinal with a custom range. Built with D3 v7, it uses d3.csv for data loading, d3.scaleLinear for positioning and size, and SVG circles for rendering. The chart also includes axis labels and size legend annotations.