This stacked bar chart shows chocolate sales (in units) across five regions for six chocolate types, with sales values accessible via interactive tooltips on mouseover. It uses D3.js v7 with SVG rendering, loading data from a CSV file. The chart employs `d3.stack` for stacking, `d3.scaleOrdinal` for color assignment, and `d3.axisBottom`/`d3.axisLeft` for axes. A manually drawn legend and CSS-styled tooltips enhance interactivity, while region colors follow `d3.schemeSet2`.