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docs/features/checked/web/witness-viewer-ui.md

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+# Witness Viewer UI
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Witness viewer UI component in the shared UI library, plus a witness page within the reachability feature area.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/ui/witness-viewer/`
+- **Components**:
+  - `witness-viewer` (`src/Web/StellaOps.Web/src/app/shared/ui/witness-viewer/witness-viewer.component.ts`)
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to the relevant page/section where this feature appears
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the component renders correctly with sample data
+  - [ ] Verify interactive elements respond to user input
+  - [ ] Verify data is fetched and displayed from the correct API endpoints
+- **Edge cases**:
+  - [ ] Verify graceful handling when backend API is unavailable (error state)
+  - [ ] Verify responsive layout at different viewport sizes
+  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)