A line chart displays cumulative COVID-19 deaths over time on a linear y-axis, using data from the COVID-19 Data Repository by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. React components render an SVG with d3.scaleTime and d3.scaleLinear axes, while d3.line generates the path. Dashed marker lines annotate specific dates and death totals, and gridlines are styled via tick size and CSS.