This example visualizes the Iris dataset as a scatter plot, mapping petal length on the x-axis and sepal length on the y-axis. Each data point is rendered as a circle on a full-screen SVG canvas using D3 v7. The code loads the CSV data from a GitHub Gist via `d3.csv`, then uses `d3.scaleLinear` with `d3.extent` to compute the scales. Axes are added with `d3.axisLeft` and `d3.axisBottom`, while the tick labels are enlarged to 24 pixels for readability.