This interactive scatter plot visualizes the Iris dataset, letting viewers choose which flower measurements to display on the X and Y axes via dropdown menus. The chart renders as SVG circles with smooth 1000-millisecond transitions, using D3 v6’s `selection.join` to handle enter, update, and exit states. Axes update automatically with `axisLeft` and `axisBottom`, while menus built with a reusable `menu` factory dispatch change events to re-assign the xValue and yValue accessors. Data loads from a GitHub-hosted CSV file, parsed with numeric coercion for the four measurement columns.