This example shows a pie chart of COVID-19 data loaded from the Our World in Data CSV file, with the total cases aggregated per location. It uses D3 v7’s `d3.csv` to fetch the data, `d3.pie` and `d3.arc` to generate the chart geometry, and SVG paths with mouseover tooltips for interactivity. The page also includes a large CSS-styled message, and while the chart logic references variables like `covid_data` and `data` that are not fully defined in the visible code, the rendering approach relies on standard D3 selections and transitions.