This example displays the classic Iris dataset as an animated scatter plot, cycling through the four measured features (petal width, sepal width, petal length, and sepal length) on the x-axis every 20 seconds while sepal length stays on the y-axis. Built with D3 v6, it uses `scaleLinear`, `extent`, `axisLeft`, and `axisBottom` to compute scales and draw axes, with the `scatterPlot` function providing a reusable API via method chaining. Each feature’s values map to circle positions with a fixed radius, and the visualization renders in SVG, resizing to fill the browser window.