This example shows a bar chart of population by country, with bars colored by religion and tooltips displaying population values on hover. The visualization is built using the Vega-Lite API, which registers Vega and Vega-Lite libraries and uses a custom configuration to adjust axis and label styling for readability. Data is loaded asynchronously from a CSV file via `d3.csv`, and the chart is rendered as SVG with an autosized fit to the window. The code also integrates the Vega Tooltip handler for interactive hover details.