Fork of Vega-Lite API Template
This example shows a stacked bar chart of population by country, with bars segmented by religion and tooltips displaying population values on hover. It uses the Vega-Lite API to build the visualization, with `vl.markBar()` and encodings for country, population, and religion, while `vega-tooltip` provides interactive popups. Data comes from a CSV file loaded via D3’s `csv` function, and the chart is rendered as SVG, configured with a custom theme for larger axis labels and titles.