This example visualizes the population distribution of religions by country, using a circle size to represent population counts. It shows data for multiple countries and religions, with a tooltip displaying the exact population on hover. The visualization is built with the Vega-Lite API, which is registered with Vega, Vega-Lite, and D3 in the browser. Data is loaded from a CSV file using d3.csv, and the view is rendered as an SVG that automatically fits the window size with a custom dark theme for labels and axes.