This interactive scatter plot visualizes the Iris dataset, comparing sepal length and width across three iris species using a custom color scale. The chart loads CSV data via `d3.csv` and renders SVG circles with configurable radius, opacity, and stroke. A legend with hover interactions dims non-matching points using `mouseenter` and `mouseleave` events. The visualization uses d3 scales for axes and the ResizeObserver API to adapt to container dimensions.