This example visualizes the relative population sizes of religious groups across countries using a bubble chart, where circle size encodes population and the axes list countries and religions. The visualization is built with the Vega-Lite API, which registers Vega and Vega-Lite libraries, and uses D3’s `csv` loader to fetch data from a Gist derived from the UCI Auto MPG dataset. It applies a custom dark-themed configuration for axes and labels, and renders as a responsive SVG that fits the window, with tooltips enabled through `vega-tooltip`.