A sequences sunburst visualization displays hierarchical path data as a ring of arcs, where each arc’s angle and radius encode the value of a sequence segment. Hovering over an arc highlights its ancestor chain and shows a breadcrumb trail in the upper left, along with the percentage of visits that begin with that sequence. The code uses D3 v4 APIs including `d3.partition`, `d3.hierarchy`, `d3.arc`, and `d3.scaleOrdinal` with `d3.schemeTableau10` for coloring. Data is loaded from CSV files via `d3.text` and `d3.csvParseRows`.