A scatterplot of the Iris dataset displays petal width against petal length, with each flower as a red semitransparent circle. The code uses D3 v6 modules including `select`, `csv`, `scaleLinear`, `extent`, `axisLeft`, `axisBottom`, and `format` to load data from the UCI Machine Learning Repository, map values to linear scales, and render axes with tick lines and labels via SVG. Axis titles and a chart title are added as text elements, while the visualization omits species encoding, showing only the raw numeric relationship.