This example visualizes temperature readings in San Francisco over time as a smooth, filled area chart. The SVG rendering uses D3.js v5’s `scaleTime` and `scaleLinear` for the axes, with `area()` and `curveBasis` to generate the smoothed, filled path. Grid lines are drawn via `axisLeft` and `axisBottom` with negative tick sizes, and the data is loaded from a remote CSV file. The chart includes labeled axes and a title, with styling applied through an external CSS file.