This interactive scatter plot visualizes Fisher's Iris dataset, comparing sepal length and width across three iris species, with data points colored by species. The visualization includes a legend that filters and highlights points on hover, dimming non-selected species through opacity changes. Built with vanilla D3.js (v7), the code uses `scaleLinear`, `scaleOrdinal`, `axisBottom`, and `axisLeft` for scales and axes, while leveraging a ResizeObserver for responsive layout. The BBC-style color scheme and typography are applied via CSS classes, with data loaded from a remote CSV file.