This example demonstrates how to build an interactive scatter plot using the Vega-Lite API wrapper for D3.js, visualizing the relationship between miles per gallon and horsepower for various car models. The visualization encodes fuel efficiency on the x-axis, engine power on the y-axis, country of origin as color, and vehicle weight as point size, with a tooltip showing the car name. It loads automobile dataset from a CSV file using D3’s `csv` function and renders the chart via the `vega-lite-api` library, which converts the specification into Vega for display. The custom styling comes from a `config` object that adjusts axis and label fonts.