This visualization plots the Iris dataset’s petal length against petal width, using a D3.js scatter plot rendered as SVG. Circles are colored by species (light blue, light pink, or yellow) with radii fixed at five pixels. The code fetches CSV data from a GitHub gist, applies `d3.scaleLinear` for axes, and uses `d3.select` and `.join` for efficient element creation. Axis labels and tick marks are styled with custom font sizes.