This example displays a multi-series line chart where each line represents a category over time. A dropdown menu allows the viewer to select a specific group, which triggers a smooth transition that updates the displayed path to show that group’s data. The visualization uses D3 v6, reading CSV data from a remote URL, with an ordinal color scale and linear axes for years and numeric values. The chart is rendered as an SVG and the update is animated via a one-second transition on the path’s `d` attribute.