A line chart tracks the cumulative number of COVID-19 deaths over time, using data from the Johns Hopkins Coronavirus dataset. The visualization employs a linear y-axis scale, with the chart area populated by a single black path rendered via an SVG `<path>` element. The code leverages d3's `scaleTime`, `scaleLinear`, and `line` functions to map dates and death totals, while React components manage the axes. A small, fixed circle appears in the upper-left corner of the plot area.