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git.stella-ops.org/docs/features/unchecked/web/a-b-deploy-diff-panel.md

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# A/B Deploy Diff Panel
## Module
Web
## Status
IMPLEMENTED
## Description
Full deployment diff panel comparing security state between two image versions (A/B) with SBOM side-by-side view, component diff rows, policy hit annotations, override dialog, and deploy action bar. Enables visual security review before promotion.
## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/deploy-diff/`
- **Routes**: `deploy-diff.routes.ts`
- **Components**:
- `component-diff-row` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/component-diff-row/component-diff-row.component.ts`)
- `deploy-action-bar` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/deploy-action-bar/deploy-action-bar.component.ts`)
- `deploy-diff-panel` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/deploy-diff-panel/deploy-diff-panel.component.ts`)
- `override-dialog` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/override-dialog/override-dialog.component.ts`)
- `policy-hit-annotation` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/policy-hit-annotation/policy-hit-annotation.component.ts`)
- `sbom-side-by-side` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/components/sbom-side-by-side/sbom-side-by-side.component.ts`)
- **Services**:
- `deploy-diff` (`src/Web/StellaOps.Web/src/app/features/deploy-diff/services/deploy-diff.service.ts`)
- **Models**:
- `src/Web/StellaOps.Web/src/app/features/deploy-diff/models/deploy-diff.models.ts`
- **Source**: batch_38/file_18.md
## E2E Test Plan
- **Setup**:
- [ ] Log in with a user that has appropriate permissions
- [ ] Navigate to `/deploy-diff`
- [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
- **Core verification**:
- [ ] Verify the panel/drawer opens on trigger (click, keyboard shortcut)
- [ ] Verify the panel displays the correct detail data for the selected item
- [ ] Verify the panel can be closed (X button, Escape key, backdrop click)
- **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)