A multi-line chart displays several vital-sign measurements over time for a single patient, with each line colored by metric type. The visualization uses D3 v5 to render SVG paths and includes a custom tooltip that appears on hover. The code relies on d3.nest, d3.line, d3.area, and d3.scaleOrdinal, with jQuery used for tooltip interactions. Data comes from a local CSV file with patient measurements. Mouseover events highlight the hovered line and dim the others, while a vertical gridline helps compare values across time points.