A fork of the MedData timeline visualization displays nested medical measurements over time. The chart uses SVG rendering with D3 v5 to draw layered line and area paths representing different patient vitals, including heart rate and diastolic pressure, distinguished by color. A vertical time axis and tooltip are implemented, though interaction handlers are not wired. Data is loaded from a CSV file containing patient records. The visualization nests the data by measurement type using `d3.nest()` and sorts the series.