This visualization displays a scatter plot of historical automobile data, plotting horsepower against miles per gallon, with point color encoding weight and size encoding displacement. Built with the Vega-Lite API, the code uses `vl.markCircle`, `vl.x().fieldQ()`, and `vl.y().fieldQ()` to define the encoding channels, while `vega-tooltip` provides interactive hover details. The data is loaded asynchronously via `d3.csv` from a GitHub-hosted CSV file containing auto-mpg measurements. The visualization renders using the Vega renderer within an SVG view, configured with custom axis styles for readability.