This example displays San Francisco temperature trends over time using a line mark from the Vega-Lite API, with tooltips revealing exact temperature values. The visualization pulls weekly temperature data from a CSV file via d3.csv, then renders it with vega, vega-lite, and vega-lite-api. The chart is configured with custom axis styling and a dark color scheme for readability, and it automatically fits to the full browser window size using the autosize option.