This example presents a stacked horizontal bar chart showing population percentages for multiple countries from 1950 to 1955. The visualization loads data from a CSV file and uses D3 v7’s `d3.stack()` and `d3.scaleOrdinal()` with a custom color palette to layer yearly values per country. SVG rendering with `d3.axisBottom` and `d3.axisLeft` displays axes, while interactive tooltips appear on mouseover to reveal exact percentage values, using `d3.select` and event handlers to update a positioned div.