This example visualizes automobile fuel-efficiency data by plotting engine horsepower against miles per gallon, with colored points indicating the country of origin and point size encoding horsepower values. It uses the Vega-Lite API to construct the chart specification, which is then rendered through Vega-Lite’s compilation to Vega, with D3.js handling CSV data loading. The visualization employs a custom dark theme, tooltips, and auto-sizing to fill the browser window, all orchestrated via JavaScript modules that register the Vega-Lite API and D3’s CSV parser.