This reusable D3.js scatter plot visualizes the Iris dataset, plotting petal length on the x-axis against sepal length on the y-axis for individual flower samples. Built with d3 v6, it loads CSV data via `d3.csv` with a custom `parseRow` function to convert numeric columns, then renders circles using the `join` API. The chart uses `d3.scaleLinear` for both axes, includes axis labels, and creates a full-window SVG with fixed margins of 20 pixels on top and 30 on the bottom.