This example presents a scatter plot of the Iris dataset, visualizing the relationship between petal length on the x-axis and petal width on the y-axis, with circles colored by species (setosa, versicolor, and virginica) using skyblue, lightgreen, and orange. The chart also encodes sepal length and width as circle radii properties on the SVG elements. It loads CSV data from a GitHub repository, parses numeric fields, and uses D3 v6 APIs including `scaleLinear`, `extent`, `axisLeft`, `axisBottom`, and `select` to render axes and circles in an SVG canvas sized to the browser window.