This example from the VizHub gallery visualizes the percentage composition of the Iris dataset across its three species. The horizontal stacked bar chart displays each species as a bar, with segments representing the proportional measurements of sepal length, sepal width, petal length, and petal width. Built with D3 v7, the visualization uses `d3.stack()` for stacking, `d3.scaleLinear()` and `d3.scaleBand()` for axes, and includes interactive tooltips on mouseover that show precise percentage values for each segment. The data is loaded from an included CSV file.