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CSA Loom — the Microsoft Fabric experience for Azure tenants where Fabric isn't yet available: lakehouses, warehouses, notebooks, semantic models, Activator rules, Data Agents, across Commercial, GCC, GCC-High, and DoD IL5

Global parity gap: Tab strip (open tabs)

Validated: 2026-05-26
Surface: Multi-tab strip in top bar (Home + per-item tabs)
Component: apps/fiab-console/lib/components/tab-strip.tsx
Fabric reference: Fabric top bar carries 1-3 tabs typically + overflow chevron
Backend probed: GET /api/tabs 200 returns user's persisted tab list

What renders

  • role="tablist" with each tab as <a role="tab" aria-selected> linking to its href
  • Home is pinned (no X), other tabs have Dismiss12Regular X button per tab
  • Persisted to Cosmos tabs-state container per user, AND to localStorage loom.tabs.cache.v1
  • Auto-open policy: lands on /items/*/*, /workspaces/[id], /apps/[id] → tab added
  • Each tab is max-width: 220px with text ellipsis

Functional probes (auth'd, 11 tabs open, viewport 1600px)

  • Tab strip renders all 11 tabs — but extends from x=296 to x=2792 (1600px past viewport)
  • BLOCKER: tab strip overflows horizontally past the global actions toolbar (x=1420 Learn icon, x=1456 Admin icon) — tabs visibly overlap the right-side action icons
  • No overflow chevron / scroll-arrow / more-button affordance
  • overflow-x: auto is set but scrollbar is hidden via ::-webkit-scrollbar { display:none } — there's no way to scroll horizontally with mouse + no other affordance
  • Tabs are NOT draggable / reorderable

Row-by-row matrix

Fabric element Loom: present Severity Notes
Home tab (pinned) YES — Real, can't be closed
Per-item tab YES — Auto-opens on item editor navigation
Close X per tab YES — Calls POST /api/tabs with filtered list
Tab activation persists across reload YES — Cosmos + localStorage
Active tab visual YES — Lighter bg + boxShadow inset
Tab strip overflow handling NO BLOCKER When 5+ tabs, overflows past viewport. Hidden scrollbar. No chevron. Hides global actions.
Drag to reorder NO MAJOR Fabric supports drag-reorder
Right-click context menu (Close all / Close others) NO MAJOR Fabric has this
New-tab indicator (Ctrl+T) NO MINOR Not standard in Fabric either; skip

Grade: C

Tabs PERSIST (real Cosmos backend), tabs CLOSE, tabs route correctly. But overflow handling is broken — once you have 5+ tabs, the strip spills past viewport and visually obstructs the right-side toolbar. No way to reorder. No context menu. This is the user's #1 daily-pain surface, and the parity gap is BLOCKER-level.