This example visualizes the temperature in San Francisco over time using a line and area chart. It plots a smooth, maroon line to represent temperature changes across a time series, with axes labeled “Date” and “temperature” and a title “Temperature in San Francisco.” The visualization is built with D3 v6, using `scaleTime` and `scaleLinear` for scaling, `axisBottom` and `axisLeft` for axes, and `line` with `curveBasis` for the smoothed path. Data is loaded from a CSV file, with timestamps parsed as `Date` objects and temperatures as numbers.