This example visualizes a week of temperature readings in San Francisco using an area chart that fills the space between a curve and the baseline. The chart includes labeled axes for time and temperature, with gridlines and a title. The code uses D3 v7’s `csv` loader to fetch the dataset, `scaleTime` and `scaleLinear` for scales, `axisBottom` and `axisLeft` for axes, and the `area` generator with `curveBasis` to create the smooth filled path rendered as SVG.