A line chart tracks cumulative COVID-19 deaths worldwide over time, using data from the Johns Hopkins Coronavirus Dataset. A horizontal black marker line highlights the point where total deaths reach one million. The visualization is built with React and D3 v5, employing `scaleTime`, `scaleLinear`, and `line` to generate the SVG path, while a separate `<line>` element marks the one-million death threshold. Data is loaded via `csv` and transformed by summing daily death totals across all countries.