This example shows a stacked bar chart of three region values across four years, with each bar segment colored by region and labeled with year and value axes. The chart is rendered as SVG using D3 v7, leveraging `d3.stack()` to compute the layered series, `d3.scaleBand` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.schemeSet2` for categorical colors. The data is embedded directly in the script rather than loaded from the CSV file, and axes are added via `d3.axisBottom` and `d3.axisLeft`.