Iris Parallel Coordinate Plot
This example shows a parallel coordinate plot of the classic Iris dataset, using the D3.js library. It displays four measurements (sepal and petal length and width) on parallel axes, with each flower's values connected by a line, colored by species. The code uses `d3.scalePoint` for axis positioning, `d3.scaleLinear` per dimension, and `d3.drag` for interactive reordering of axes. Data is loaded from `iris.csv` and rendered as SVG with partial opacity to reveal density, with transitions on axis drag.