This visualization shows the cumulative global death toll from COVID-19 over time as a single black line chart, with a horizontal marker line highlighting the point at which 100,000 deaths were reached. The chart uses React to manage the SVG rendering, while D3 v6 functions like `scaleTime`, `scaleLinear`, `extent`, and `line` compute the scales and path geometry. The data is fetched live from the CSSEGISandData GitHub repository’s time-series CSV and aggregated by summing daily deaths across all countries. The full-viewport SVG is drawn with a stroke-width of 4 for the main path and a thinner line for the fixed threshold.