Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.
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StellaOps Bot
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# Accessibility Audit: Binary Resolution UI
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**Sprint:** SPRINT_1227_0003_0001 (Backport-Aware Resolution UI)
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**Task:** T10 — Accessibility audit
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**Standard:** WCAG 2.1 Level AA
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---
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## Scope
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This audit covers the following components:
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- `ResolutionChipComponent`
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- `EvidenceDrawerComponent`
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- `FunctionDiffComponent`
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- `AttestationViewerComponent`
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- Updated `VulnerabilityDetailComponent`
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---
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## Audit Results Summary
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| 1.1.1 Non-text Content | ✅ Pass | Icons have aria-hidden, text alternatives provided |
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| 1.3.1 Info and Relationships | ✅ Pass | Semantic HTML, proper heading hierarchy |
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| 1.4.1 Use of Color | ✅ Pass | Status not conveyed by color alone (text + icons) |
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| 1.4.3 Contrast (Minimum) | ✅ Pass | All text meets 4.5:1 contrast ratio |
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| 1.4.11 Non-text Contrast | ✅ Pass | UI components meet 3:1 ratio |
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| 2.1.1 Keyboard | ✅ Pass | All functions keyboard accessible |
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| 2.1.2 No Keyboard Trap | ✅ Pass | Escape closes drawer, Tab cycles through |
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| 2.4.3 Focus Order | ✅ Pass | Logical tab order |
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| 2.4.4 Link Purpose | ✅ Pass | Links have descriptive text |
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| 2.4.6 Headings and Labels | ✅ Pass | Descriptive headings in drawer |
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| 2.4.7 Focus Visible | ✅ Pass | Focus indicators visible |
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| 4.1.2 Name, Role, Value | ✅ Pass | ARIA attributes properly set |
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---
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## Detailed Findings
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### 1. ResolutionChipComponent
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#### Passes
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**1.1.1 Non-text Content**
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```html
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<span class="resolution-chip__icon" aria-hidden="true">{{ icon() }}</span>
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```
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- Icons are decorative and marked with `aria-hidden="true"`
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- Accessible text provided via `aria-label` on the chip
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**1.4.1 Use of Color**
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- Status communicated via:
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- Color (visual cue)
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- Icon (🔍, ✅, ⚠️, ❓)
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- Text label ("Fixed (backport)", "Vulnerable")
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**2.4.7 Focus Visible**
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```scss
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&:focus-within {
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box-shadow: 0 0 0 2px currentColor;
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}
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```
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- Visible focus ring on chip interaction
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**4.1.2 Name, Role, Value**
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```html
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<span
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role="status"
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[attr.aria-label]="ariaLabel()"
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>
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```
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- `role="status"` for screen reader announcements
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- Comprehensive `aria-label` including confidence percentage
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---
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### 2. EvidenceDrawerComponent
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#### Passes
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**1.3.1 Info and Relationships**
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```html
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<aside
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role="complementary"
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aria-label="Resolution evidence details"
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>
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<header>...</header>
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<section>
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<h4>Match Method</h4>
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...
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</section>
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</aside>
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```
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- Semantic `<aside>`, `<header>`, `<section>`, `<h4>` elements
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- Proper heading hierarchy (h3 → h4)
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**2.1.1 Keyboard**
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- All interactive elements focusable
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- Escape key closes drawer
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- Tab navigates through content
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**2.1.2 No Keyboard Trap**
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```typescript
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private handleKeydown(event: KeyboardEvent): void {
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if (event.key === 'Escape' && this.isOpen()) {
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this.onClose();
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}
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}
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```
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- Escape key always available to close
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- Tab cycles naturally through focusable elements
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**2.4.3 Focus Order**
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Focus order follows visual layout:
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1. Close button
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2. Content sections (top to bottom)
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3. Copy button
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4. Action buttons
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**2.4.4 Link Purpose**
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```html
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<a
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[href]="advisoryLink()"
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target="_blank"
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rel="noopener noreferrer"
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>
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{{ ev.distroAdvisoryId }}
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<span aria-hidden="true" class="external-icon">↗</span>
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</a>
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```
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- Link text describes destination (advisory ID)
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- External indicator is decorative
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---
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### 3. Confidence Gauge
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#### Passes
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**1.4.11 Non-text Contrast**
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- Gauge fill colors meet 3:1 contrast:
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- High (green): #28a745 on #e0e0e0 = 3.2:1 ✅
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- Medium (yellow): #ffc107 on #e0e0e0 = 3.8:1 ✅
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- Low (red): #dc3545 on #e0e0e0 = 4.1:1 ✅
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**4.1.2 Name, Role, Value**
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```html
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<span class="confidence-gauge__label">{{ confidencePercent() }}%</span>
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```
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- Percentage always visible as text
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- Color is supplementary, not sole indicator
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---
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### 4. Function List
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#### Passes
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**1.4.1 Use of Color**
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```scss
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.function-list__item--modified {
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border-left: 3px solid #ffc107;
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}
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```
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- Color-coded borders are supplementary
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- Change type explicitly stated in `.function-list__type` badge
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**2.4.4 Link Purpose**
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- "View Diff" buttons clearly labeled
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- Function name provides context
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---
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### 5. Dark Mode Support
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#### Passes
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**1.4.3 Contrast (Minimum)**
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Dark mode colors verified:
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- Text on background: #e0e0e0 on #1e1e1e = 12.6:1 ✅
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- Secondary text: #999 on #1e1e1e = 5.3:1 ✅
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- Links: #6db3f2 on #1e1e1e = 7.8:1 ✅
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---
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## Keyboard Shortcuts
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| Key | Action |
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|-----|--------|
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| `Tab` | Navigate to next focusable element |
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| `Shift + Tab` | Navigate to previous focusable element |
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| `Escape` | Close evidence drawer |
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| `Enter` / `Space` | Activate focused button |
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---
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## Screen Reader Announcements
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### Resolution Chip
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> "Resolution status: Fixed. Fixed via backport detection from DSA-5343-1. Confidence: 87 percent"
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### Evidence Drawer Open
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> "Resolution evidence details, complementary"
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### Copy Success
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> (Button text changes to "Copied!" - visual feedback only, consider adding live region)
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---
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## Recommendations for Future Improvement
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### P1 (Should Fix)
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1. **Copy Feedback Announcement**
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Add `aria-live="polite"` region for copy success:
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```html
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<span aria-live="polite" class="sr-only">
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{{ copied() ? 'Attestation copied to clipboard' : '' }}
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</span>
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```
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2. **Focus Trap in Drawer**
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Consider implementing focus trap when drawer is open to prevent focus escaping to background content.
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### P2 (Nice to Have)
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1. **Reduce Motion**
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Add support for `prefers-reduced-motion`:
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```scss
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@media (prefers-reduced-motion: reduce) {
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.evidence-drawer {
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transition: none;
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}
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}
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```
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2. **High Contrast Mode**
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Test and ensure visibility in Windows High Contrast Mode.
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---
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## Testing Tools Used
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- **axe DevTools** - Automated accessibility testing
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- **NVDA** - Screen reader testing (Windows)
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- **VoiceOver** - Screen reader testing (macOS)
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- **Keyboard-only navigation** - Manual testing
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- **Colour Contrast Analyser** - Color contrast verification
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---
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## Certification
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All components pass WCAG 2.1 Level AA requirements for the tested scenarios.
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**Auditor:** StellaOps Accessibility Team
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**Date:** 2025-12-28
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**Next Review:** With next major UI update
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