This example shows a stacked bar chart of the Iris dataset, with sepal length binned into intervals and each bar segmented by species counts. The chart uses an SVG canvas and relies on the D3 version 6 API, including `d3.scaleBand`, `d3.scaleLinear`, `d3.axisBottom`, `d3.axisLeft`, `d3.scaleOrdinal`, and `d3.stack` to create stacked rectangles from the preprocessed data. The visualization displays three color-coded species groups across the horizontal bins, with the y-axis scaled to a fixed maximum of 30.