This visualization displays the classic Iris dataset as an interactive parallel coordinate plot, with each flower’s measurements across sepal length, width, petal length, and width drawn as semi-transparent polylines colored by species. Users can drag the vertical axes to reorder dimensions via `d3.drag`, which updates the d3.line paths and axis positions. A dropdown menu toggles the y-axis scale between a union range (0–8) and per-attribute extents computed with `d3.extent`. Axis labels and the title are rendered as SVG text, and rendering uses D3 v5 with SVG elements.