This scatter plot visualizes the relationship between fuel efficiency (mpg) and horsepower for classic automobiles, with point size encoding weight and color indicating country of origin. The visualization is built using the Vega-Lite API, which wraps Vega-Lite specifications in JavaScript methods. Data is loaded asynchronously from a CSV file via d3.csv, sourced from the UCI Machine Learning Repository’s Auto MPG dataset. The code configures axis labels, tooltips, and a fixed-point rendering style, and renders the chart to SVG using the Vega renderer.