This example demonstrates an animated scatterplot of the Iris dataset, cycling through different pairings of sepal and petal measurements on the x-axis while the y-axis remains fixed on sepal length. It uses D3’s `csv` loader, `scaleLinear`, `axisLeft`, `axisBottom`, and `selectAll`/`join` to render the SVG points and axes. A custom ES6 module defines a reusable `scatterPlot` function, while `setInterval` triggers the axis updates. Color-coded legend markers distinguish the three Iris species.