This line chart displays the global cumulative COVID-19 death toll over time from the Johns Hopkins dataset, with a vertical marker line at the current date and a horizontal marker line at the one-million-death threshold. The visualization uses React to render an SVG path generated by d3.line, with d3.scaleTime and d3.scaleLinear mapping dates and death totals. Marker lines are drawn as separate React components (XMarkerLine, YMarkerLine) using d3 scales for positioning, while the data is loaded and parsed via d3.csv.