A stacked bar chart visualizes the distribution of horsepower, torque, and highway MPG metrics across 31 car makes, with each bar segmented to show the proportional contribution of each metric. The chart uses D3.js v7 with SVG rendering, employing `d3.stack()` to generate stacked series and `d3.scaleOrdinal` to assign colors. Hovering over a segment displays a tooltip showing the exact metric value formatted with `d3.format('.2f')`. The data comes from a CSV containing average specifications, with axes labeled "Value" and "Rating" for clarity.