# Gate Explain Drawer

## Module
Web

## Status
VERIFIED

## Description
Slide-in drawer explaining why a policy gate passed or failed, showing each rule evaluation, evidence inputs, and what would need to change for a different outcome.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/overlays/gate-explain-drawer/`
- **Components**:
  - `gate-explain-drawer` (`src/Web/StellaOps.Web/src/app/shared/overlays/gate-explain-drawer/gate-explain-drawer.component.ts`)
- **Source**: SPRINT_20260118_009_FE_route_migration_shared_components.md

## 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 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/gate-explain-drawer/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): 2026-02-11