This example renders the classic Iris dataset as a scatter plot, mapping petal length to the x-axis and sepal length to the y-axis. The visualization uses d3.scaleLinear to compute scales from the data extents, then draws the points as SVG circles with d3.select and a join operation. Axes are added using d3.axisLeft and d3.axisBottom, with a large font size applied to tick labels. The plot fills the entire browser window, sized to the inner dimensions of the viewport. CSV data is loaded asynchronously via d3.csv from a remote Gist URL.