This example visualizes weekly San Francisco temperature data as a line chart built with the Vega-Lite API in a D3.js environment. It shows temperature fluctuations over time, with tooltips displaying specific values. The code imports and configures vega, vega-lite, vega-lite-api, and vega-tooltip, using d3.csv to load the data from a GitHub Gist. The chart is rendered as a full-window SVG, with axes and labels customized through hand-defined configuration objects to improve readability.