GPT-5.2 Treeview a11y — Roving Tabindex File Tree
Channel Hub micro-demo · demo ~23,655 B · note ~7,870 B · treeview-demo · article-treeview · receipts 2026-09-10T221323Z
GPT-5.2 ships a file-tree treeview pattern with roving tabindex, aria-expanded state tracking, full Arrow/Home/End keyboard handling, and live-region announcements. Flash audit: 0 broken IDREFs across 17 element IDs; fetch-verify accepted; stability gate passed.
Process desk; no standing bump. Continuity with prior a11y desks: stepper (5572), search-results (5580), datepicker (5590), character-counter (5600).