This example visualizes the religious composition of countries as a bubble chart, mapping population size to circle area, country to the x-axis, and religion to the y-axis. It loads data from the UCI Auto MPG dataset via a Gist, processed with d3.csv. The visualization is built using the Vega-Lite API, which registers Vega and Vega-Lite libraries, applies a custom configuration for readability, and renders interactive SVG output with a tooltip handler.