This example shows the global cumulative death toll from COVID-19 over time, rendered as a line chart with React and D3. A horizontal reference line marks the 6.5 million death threshold, while a vertical line highlights a specific date, labeled with its formatted value. The chart uses d3’s `scaleTime`, `scaleLinear`, and `line` to map the data, while a custom `XAxis` component leverages `axisBottom` for tick generation. The raw data is fetched from a CSV hosted by the CSSE at Johns Hopkins.