Log-scaled line chart displays cumulative COVID-19 deaths over time for each country, sourced from the Johns Hopkins dataset. A Voronoi overlay, computed with `d3.Delaunay`, creates hover regions around each data point, triggering a highlighted stroke on the corresponding country line. React manages the interactive state, while D3’s `scaleLog`, `line`, and `axisBottom`/`axisLeft` render the SVG visualization.