This chart shows the cumulative global death toll from COVID-19 over time, with a horizontal marker line at the one-million-death milestone and a vertical marker at the most recent date. Built with React and D3 v5, it uses `scaleTime`, `scaleLinear`, and `line` to render an SVG path. Data comes from the CSSE COVID-19 time series, and the axes are drawn with `axisBottom` and custom marker components.