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git.stella-ops.org/docs/features/unchecked/web/graph-split-view-with-diff-engine.md

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# Graph Split View with Diff Engine
## Module
Web
## Status
IMPLEMENTED
## Description
Visual graph diff engine with split-view component for comparing two dependency/SBOM graphs side by side with change highlighting, diff computation, and synchronized navigation.
## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/graph/`
- **Components**:
- `graph-canvas` (`src/Web/StellaOps.Web/src/app/features/graph/graph-canvas.component.ts`)
- `graph-explorer` (`src/Web/StellaOps.Web/src/app/features/graph/graph-explorer.component.ts`)
- `graph-filters` (`src/Web/StellaOps.Web/src/app/features/graph/graph-filters.component.ts`)
- `graph-hotkey-help` (`src/Web/StellaOps.Web/src/app/features/graph/graph-hotkey-help.component.ts`)
- `graph-overlays` (`src/Web/StellaOps.Web/src/app/features/graph/graph-overlays.component.ts`)
- `graph-side-panels` (`src/Web/StellaOps.Web/src/app/features/graph/graph-side-panels.component.ts`)
- **Services**:
- `graph-accessibility` (`src/Web/StellaOps.Web/src/app/features/graph/graph-accessibility.service.ts`)
- **Source**: Feature matrix scan
## E2E Test Plan
- **Setup**:
- [ ] Log in with a user that has appropriate permissions
- [ ] Navigate to `/graph`
- [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
- **Core verification**:
- [ ] Verify side-by-side comparison view renders correctly with two versions
- [ ] Verify additions, removals, and changes are visually highlighted
- [ ] Verify diff data matches the expected delta between versions
- **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)