A stacked bar chart displays total usage per operation, with each rectangular segment sized proportionally to its contribution and labeled with absolute values, percentages, and operation codes. The chart uses D3 v5’s `scaleLinear` for positioning and percent calculations, `scaleOrdinal` with `schemeCategory10` for segment colors, and `sum` to compute the overall total. Data is loaded from a local JSON file via `json()`, and the visualization is rendered as SVG, with text elements placed above and within each bar segment.