This example visualizes car performance data from the auto-mpg dataset, plotting horsepower against miles per gallon and coloring points by country of origin. The visualization uses the Vega-Lite API to define a scatter plot with circles, where both color and size encode variables, and tooltips display car names. It loads data via d3.csv, configures a dark theme with custom axis styling, and renders the chart as SVG using Vega-Lite’s vega-lite-api library, integrated with vega-tooltip for interactive hover details.