This example uses a D3.js scatter plot to visualize the Iris dataset, plotting sepal length against petal length while encoding species through distinct point shapes. The visualization includes labeled axes, a custom shape legend, and a responsive SVG canvas that fills the browser window. The code leverages D3’s `scaleLinear`, `scaleOrdinal`, `symbolsFill`, and `symbol` APIs, along with helper modules for axes and legend rendering, and fetches the CSV data from a remote GitHub repository.