# Delta Summary Strip

## Module
Web

## Status
VERIFIED

## Description
Delta summary strip component shows before/after comparison statistics in the compare view header.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/compare/`
- **Components**:
  - `actionables-panel` (`src/Web/StellaOps.Web/src/app/features/compare/components/actionables-panel/actionables-panel.component.ts`)
  - `baseline-rationale` (`src/Web/StellaOps.Web/src/app/features/compare/components/baseline-rationale/baseline-rationale.component.ts`)
  - `baseline-selector` (`src/Web/StellaOps.Web/src/app/features/compare/components/baseline-selector.component.ts`)
  - `categories-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/categories-pane.component.ts`)
  - `compare-view` (`src/Web/StellaOps.Web/src/app/features/compare/components/compare-view.component.ts`)
  - `compare-view` (`src/Web/StellaOps.Web/src/app/features/compare/components/compare-view/compare-view.component.ts`)
  - `degraded-mode-banner` (`src/Web/StellaOps.Web/src/app/features/compare/components/degraded-mode-banner/degraded-mode-banner.component.ts`)
  - `delta-summary-strip` (`src/Web/StellaOps.Web/src/app/features/compare/components/delta-summary-strip.component.ts`)
  - `envelope-hashes` (`src/Web/StellaOps.Web/src/app/features/compare/components/envelope-hashes/envelope-hashes.component.ts`)
  - `export-actions` (`src/Web/StellaOps.Web/src/app/features/compare/components/export-actions/export-actions.component.ts`)
  - `graph-mini-map` (`src/Web/StellaOps.Web/src/app/features/compare/components/graph-mini-map/graph-mini-map.component.ts`)
  - `items-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/items-pane.component.ts`)
  - `proof-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/proof-pane.component.ts`)
  - `three-pane-layout` (`src/Web/StellaOps.Web/src/app/features/compare/components/three-pane-layout.component.ts`)
  - `trust-indicators` (`src/Web/StellaOps.Web/src/app/features/compare/components/trust-indicators.component.ts`)
  - ... and 3 more components
- **Services**:
  - `compare-export` (`src/Web/StellaOps.Web/src/app/features/compare/services/compare-export.service.ts`)
  - `compare` (`src/Web/StellaOps.Web/src/app/features/compare/services/compare.service.ts`)
  - `delta-compute` (`src/Web/StellaOps.Web/src/app/features/compare/services/delta-compute.service.ts`)
  - `user-preferences` (`src/Web/StellaOps.Web/src/app/features/compare/services/user-preferences.service.ts`)
- **Source**: Feature matrix scan

## E2E Test Plan
- **Setup**:
  - [ ] Log in with a user that has appropriate permissions
  - [ ] Navigate to `/compare/:currentId`
  - [ ] 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)

## Verification
- Run: `docs/qa/feature-checks/runs/web/delta-summary-strip/run-001/`
- Tier 0 (source): pass (`tier0-source-check.json`)
- Tier 1 (build/tests): pass (`tier1-build-check.json`)
- Tier 2 (behavior): pass (`tier2-e2e-check.json`)
- Verified on (UTC): 2026-02-10