This interactive scatter plot visualizes the relationship between fuel efficiency (mpg), horsepower, weight, and country of origin for classic automobiles. The visualization uses the Vega-Lite API to declaratively encode data dimensions onto circle position, size, and color, with tooltips revealing car names. It renders as a responsive SVG, loading data from the UCI Auto MPG dataset via d3’s `csv` function. The example primarily demonstrates how the `vega-lite-api` library can construct specifications programmatically, complemented by vega-tooltip for interactivity and custom config for styling.