This sunburst chart visualizes hierarchical page-sequencing data from a CSV file, showing the proportion of visits that begin with each sequence of pages. The visualization uses a radial partition layout, with arcs representing nodes and an interactive breadcrumb trail displaying the current path. Built with D3 v4, it utilizes `d3.partition`, `d3.arc`, and `d3.hierarchy` to structure data, while `d3.scaleOrdinal` and `d3.schemeTableau10` assign colors to segments. Hovering over a segment highlights its ancestors in the sequence, and the central explanation shows the percentage of visits associated with that path.