This example visualizes the Iris dataset as a scatter plot, using petal length on the x-axis and petal width on the y-axis. It encodes species membership through circle colors (skyblue, lightgreen, orange) while also binding sepal length and width as additional attributes (`rx`, `ry`) on each circle. The visualization loads CSV data from a GitHub gist, parses numeric fields, and uses D3 v6 APIs including `scaleLinear`, `extent`, `axisLeft`, `axisBottom`, and `selectAll().data().join()` to render SVG circles. Axis labels are added via `svg.append('text')`, with the plot sized to the browser window dimensions.