This stacked bar chart shows the gender distribution of students across university modules, with each bar divided into female and male counts. Users can toggle between raw counts and percentages of total enrollment, which animates the bar heights and adjusts the y-axis tick format. Built with D3.js (version 3.5.6), the visualization uses `d3.layout.stack` and ordinal/linear scales, rendering as SVG with transition effects triggered by radio button inputs. Data is loaded from CSV files containing module codes and gender counts.