This example visualizes weekly temperature data for San Francisco as a single smoothed line, with each point’s exact value accessible via tooltip. It uses the Vega-Lite API to declaratively encode the timestamp and temperature fields, while the `d3.csv` loader fetches the data from a GitHub gist. The chart is styled with a custom configuration that removes axis domains and increases font sizes, and it renders as a full-window, responsive SVG via `vega-lite-api` with `vega-tooltip` for interactivity.