This stacked bar chart displays age distributions across different provinces, with each bar segmented by age ranges from 0-10 through 90-100 years. Users can toggle between raw counts and percentages of the total via radio buttons. Built with D3.js (version 3.5.6), the visualization uses SVG rendering and d3.layout.stack for stacking, d3.svg.axis for axes, and smooth transitions via transition().duration() when switching between count and percentage modes. Data comes from a CSV file containing provincial health statistics.