A stacked horizontal bar chart displays population counts for five countries, each bar segmented by religion. The visualization uses D3 v7 with SVG rendering, employing `d3.stack()`, `d3.scaleLinear`, and `d3.scaleBand`. Hovering over a segment triggers a tooltip showing the specific population value for that religion and country. The chart includes a custom legend and axis labels, with data loaded directly from an inline array rather than an external CSV file.