The Sequences sunburst visualizes hierarchical web navigation paths, showing how visits progress through pages like home, product, and search. Hovering over a segment highlights its ancestors and displays the percentage of total visits that follow that sequence in a breadcrumb trail. Built with D3 v3, it uses `d3.layout.partition` to compute arc positions and `d3.svg.arc` for rendering. The code loads CSV data via `d3.text` and `d3.csv.parseRows`, applies custom colors per segment, and uses opacity transitions and `mouseover`/`mouseleave` events to fade unrelated paths.