A line chart tracks cumulative global COVID-19 deaths over time, using data from the Johns Hopkins Coronavirus Dataset. The chart plots dates on a time scale and death totals on a linear scale, with a horizontal marker line highlighting the 500,000-death threshold. Built with React and D3 v5, the visualization uses `scaleTime`, `scaleLinear`, and `line` from d3 to generate an SVG path, while `csv` and `timeParse` handle data loading and date parsing.