This example shows a scatter plot of auto-mpg data, with a circle for each car positioned by miles per gallon and horsepower. The color of each circle encodes the car’s origin, while its size reflects the car’s weight, and hovering reveals the model name. It uses the Vega-Lite API to define the visualization declaratively, with D3’s `csv` function to load the data from the UCI Machine Learning Repository. The chart is rendered as an SVG via Vega and Vega-Lite, with tooltips provided by the vega-tooltip handler.