This interactive scatterplot visualizes the Iris dataset, plotting sepal width against petal length with points colored by species. The chart includes an interactive color legend; hovering over a legend entry fades non-matching points to 20% opacity and re-renders them in full opacity, allowing users to isolate a species. Built with React and D3 v7, it uses `scaleLinear` for axes, `scaleOrdinal` for colors, and custom React components for axes, marks, and the legend, rendering in SVG.