# SBOM Diff Side-by-Side Panel

## Module
Web

## Status
VERIFIED

## Description
Side-by-side visual comparison panel showing packages added/removed/changed between two SBOM versions, with highlighted risk changes for before/after risk state comparison.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/sbom-diff/`
- **Routes**: `sbom-diff.routes.ts`
- **Components**:
  - `sbom-diff-view` (`src/Web/StellaOps.Web/src/app/features/sbom-diff/components/sbom-diff-view/sbom-diff-view.component.ts`)
- **Services**:
  - `sbom-diff` (`src/Web/StellaOps.Web/src/app/features/sbom-diff/services/sbom-diff.service.ts`)
- **Models**:
  - `src/Web/StellaOps.Web/src/app/features/sbom-diff/models/sbom-diff.models.ts`
- **Source**: SPRINT_20251226_004_FE_risk_dashboard.md

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

## Verification
- Run: `docs/qa/feature-checks/runs/web/sbom-diff-side-by-side-panel/run-001/`
- Date (UTC): 2026-02-11