This stacked bar chart visualizes the distribution of religious affiliations across countries, using circle area to encode population size for each country-religion pair. The visualization is built with the Vega-Lite API, which registers Vega and Vega-Lite libraries to generate an SVG rendering. Data is loaded asynchronously from a CSV file via d3.csv, and the chart includes interactive tooltips handled through the vega-tooltip library. The visualization employs custom configuration for axis styling and font sizing, with automatic resizing to fit the viewport dimensions.