This visualization shows the relationship between miles per gallon and horsepower for cars from the UCI Auto MPG dataset, with points colored by origin and sized by horsepower. It uses the Vega-Lite API to construct a scatter plot with circle marks, encoding tooltips for car names. The code registers vega, vega-lite, and vega-lite-api with a tooltip handler, loads data via d3.csv, and renders an SVG chart that fits the window size. Custom axis and label styling are applied through a configuration object.