This example displays a time-series line chart of weekly temperature data for San Francisco, using the Vega-Lite API to declare marks and encodings for time on the x-axis and temperature on the y-axis. The `getData.js` file loads CSV data from a remote URL via `d3.csv`, and the chart renders with a custom dark theme and tooltips. It leverages `vega`, `vega-lite`, `vega-lite-api`, and `vega-tooltip` to build the visualization in an SVG view.