ScatterTest
This example displays the classic Iris dataset as a scatter plot, mapping sepal length on the x-axis and petal length on the y-axis. Points are color-coded by iris species using a d3.scaleOrdinal with a custom palette. The visualization uses D3 v4 with SVG rendering, building axes via d3.axisBottom and d3.axisLeft, and appending circles to a group element. The data is loaded asynchronously from a CSV file using d3.csv.