This interactive scatter plot displays the classic Iris dataset, showing sepal and petal measurements for three flower species. Users select which features appear on the x- and y-axes via a custom button panel, and the visualization updates accordingly. The code uses d3.scaleLinear, d3.axisBottom, and d3.axisLeft to render axes, with circles colored by species. Data is loaded from a CSV file and rendered as SVG elements, with the button panel implemented as reusable D3 functions.