This interactive scatter plot of the Iris dataset lets users explore relationships between sepal and petal measurements. A clickable button panel on the right selects which of the four features (sepal length, sepal width, petal length, petal width) is plotted on the x- and y-axes, updating the chart dynamically. The plot uses D3's `scaleLinear`, `axisBottom`, and `axisLeft` for axes, and renders 150 semi-transparent circles colored by species (setosa, versicolor, virginica) in blue, green, and orange. The legend and button panel are drawn with SVG elements, and the underlying data comes from the classic `iris.csv` file.