This stacked bar chart displays mobile operating system market share percentages across five global regions, with colored segments for Android, iOS, and Other. Each region’s horizontal bar spans from 0 to 100 percent, and hovering over a segment reveals its exact value via a tooltip. The visualization uses D3 v7’s `d3.stack()` to transform the CSV data, `d3.scaleBand` for region positioning, `d3.scaleLinear` for percentages, and `d3.schemeSet2` for categorical colors. SVG rendering handles the axes, while mouse events update tooltip opacity and content.