This interactive scatter plot visualizes the relationship between miles per gallon, horsepower, weight, and origin for automobiles from the UCI Machine Learning Repository’s Auto MPG dataset. Each circle, colored by country of origin, uses both its vertical position and size to encode two different quantitative variables, while a tooltip reveals the car’s name. The visualization is built using the Vega-Lite API, which composes marks and encodings declaratively, with D3.js handling data loading via `csv`. The project registers Vega-Lite and Vega with the API, applies a custom dark-themed configuration for improved readability, and renders the output as an SVG that fills the browser window.