A line chart displays the global cumulative death toll from COVID-19 over time, based on the Johns Hopkins Coronavirus dataset. The chart plots daily total deaths with a black line, and includes a horizontal marker line at 10,000 deaths and a vertical marker at the most recent date, labeled with its formatted month and day. Built with React and D3 v5, it uses `scaleTime`, `scaleLinear`, and `line` to generate an SVG path, while custom `XAxis` and marker components render grid lines and labels.