A live area chart animates the cumulative counts of confirmed cases, deaths, and recoveries from a local CSV of coronavirus data, with three gradient-filled series rendered in yellow, red, and green. The visualization uses D3.js v4 to update the x- and y-axes and paths via transitions, while Bootstrap styles the page and buttons. The chart rebuilds its series incrementally with `d3.area()`, `d3.scaleTime()`, and `d3.scaleLinear()`, and the data is fetched with `d3.csv()`.