This visualization compares sepal length and width across three iris species using a scatter plot of 150 flowers from Fisher’s Iris dataset. The chart displays data as large, semi-transparent colored circles, with each species assigned a distinct BBC-style color. Hovering over a legend item highlights that species’ points while fading others. Built with D3.js, the example uses `scaleLinear`, `scaleOrdinal`, `axisBottom`, and `axisLeft` to render the chart, and a `ResizeObserver` for responsive sizing.