Adding accessibility skill to go in with the inclusive-ui-agent

2026-04-13 21:33:32 +08:00 · 2026-04-11 12:51:21 -07:00
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+---
+name: accessibility
+description: Design, implement, and audit inclusive digital products using WCAG 2.2 Level AA
+  standards. Use this skill to generate semantic ARIA for Web and accessibility traits for Web and Native platforms (iOS/Android).
+origin: ECC
+---
+
+# Accessibility (WCAG 2.2)
+
+This skill ensures that digital interfaces are Perceivable, Operable, Understandable, and Robust (POUR) for all users, including those using screen readers, switch controls, or keyboard navigation. It focuses on the technical implementation of WCAG 2.2 success criteria.
+
+## When to Activate
+
+- Defining UI component specifications for Web, iOS, or Android.
+- Auditing existing code for accessibility barriers or compliance gaps.
+- Implementing new WCAG 2.2 standards like Target Size (Minimum) and Focus Appearance.
+- Mapping high-level design requirements to technical attributes (ARIA roles, traits, hints).
+
+## Core Concepts
+
+- **POUR Principles**: The foundation of WCAG (Perceivable, Operable, Understandable, Robust).
+- **Semantic Mapping**: Using native elements over generic containers to provide built-in accessibility.
+- **Accessibility Tree**: The representation of the UI that assistive technologies actually "read."
+- **Focus Management**: Controlling the order and visibility of the keyboard/screen reader cursor.
+- **Labeling & Hints**: Providing context through `aria-label`, `accessibilityLabel`, and `contentDescription`.
+
+## How It Works
+
+### Step 1: Identify the Component Role
+
+Determine the functional purpose (e.g., Is this a button, a link, or a tab?). Use the most semantic native element available before resorting to custom roles.
+
+### Step 2: Define Perceivable Attributes
+
+- Ensure text contrast meets **4.5:1** (normal) or **3:1** (large/UI).
+- Add text alternatives for non-text content (images, icons).
+- Implement responsive reflow (up to 400% zoom without loss of function).
+
+### Step 3: Implement Operable Controls
+
+- Ensure a minimum **24x24 CSS pixel** target size (WCAG 2.2 SC 2.5.8).
+- Verify all interactive elements are reachable via keyboard and have a visible focus indicator (SC 2.4.11).
+- Provide single-pointer alternatives for dragging movements.
+
+### Step 4: Ensure Understandable Logic
+
+- Use consistent navigation patterns.
+- Provide descriptive error messages and suggestions for correction (SC 3.3.3).
+- Implement "Redundant Entry" (SC 3.3.7) to prevent asking for the same data twice.
+
+### Step 5: Verify Robust Compatibility
+
+- Use correct `Name, Role, Value` patterns.
+- Implement `aria-live` or live regions for dynamic status updates.
+
+## Accessibility Architecture Diagram
+
+```mermaid
+flowchart TD
+  UI["UI Component"] --> Platform{Platform?}
+  Platform -->|Web| ARIA["WAI-ARIA + HTML5"]
+  Platform -->|iOS| SwiftUI["Accessibility Traits + Labels"]
+  Platform -->|Android| Compose["Semantics + ContentDesc"]
+
+  ARIA --> AT["Assistive Technology (Screen Readers, Switches)"]
+  SwiftUI --> AT
+  Compose --> AT
+```
+
+## Cross-Platform Mapping
+
+| Feature            | Web (HTML/ARIA)          | iOS (SwiftUI)                        | Android (Compose)                                           |
+| :----------------- | :----------------------- | :----------------------------------- | :---------------------------------------------------------- |
+| **Primary Label**  | `aria-label` / `<label>` | `.accessibilityLabel()`              | `contentDescription`                                        |
+| **Secondary Hint** | `aria-describedby`       | `.accessibilityHint()`               | `Modifier.semantics { stateDescription = ... }`             |
+| **Action Role**    | `role="button"`          | `.accessibilityAddTraits(.isButton)` | `Modifier.semantics { role = Role.Button }`                 |
+| **Live Updates**   | `aria-live="polite"`     | `.accessibilityLiveRegion(.polite)`  | `Modifier.semantics { liveRegion = LiveRegionMode.Polite }` |
+
+## Implementation Examples
+
+### Web: Accessible Search
+
+```html
+<form role="search">
+  <label for="search-input" class="sr-only">Search products</label>
+  <input type="search" id="search-input" placeholder="Search..." />
+  <button type="submit" aria-label="Submit Search">
+    <svg aria-hidden="true">...</svg>
+  </button>
+</form>
+```
+
+### iOS: Accessible Action Button
+
+```swift
+Button(action: deleteItem) {
+    Image(systemName: "trash")
+}
+.accessibilityLabel("Delete item")
+.accessibilityHint("Permanently removes this item from your list")
+.accessibilityAddTraits(.isButton)
+```
+
+### Android: Accessible Toggle
+
+```kotlin
+Switch(
+    checked = isEnabled,
+    onCheckedChange = { onToggle() },
+    modifier = Modifier.semantics {
+        contentDescription = "Enable notifications"
+    }
+)
+```
+
+## Anti-Patterns to Avoid
+
+- **Div-Buttons**: Using a `<div>` or `<span>` for a click event without adding a role and keyboard support.
+- **Color-Only Meaning**: Indicating an error or status _only_ with a color change (e.g., turning a border red).
+- **Infinite Tab Loops**: Modals that don't trap focus, allowing users to "escape" into the background content while the modal is open.
+- **Redundant Alt Text**: Using "Image of..." or "Picture of..." in alt text (screen readers already announce the role "Image").
+
+## Best Practices Checklist
+
+- [ ] Interactive elements meet the **24x24px** (Web) or **44x44pt** (Native) target size.
+- [ ] Focus indicators are clearly visible and high-contrast.
+- [ ] No "Keyboard Traps" exist in complex components (modals, dropdowns).
+- [ ] Forms provide text-based error suggestions.
+- [ ] All icon-only buttons have a descriptive text label.
+- [ ] Content reflows properly when text is scaled.
+
+## References
+
+- [WCAG 2.2 Guidelines](https://www.w3.org/TR/WCAG22/)
+- [WAI-ARIA Authoring Practices](https://www.w3.org/TR/wai-aria-practices/)
+- [iOS Accessibility Programming Guide](https://developer.apple.com/library/archive/documentation/UserExperience/Conceptual/iPhoneAccessibility/Introduction/Introduction.html)
+- [Android Accessibility Developer Guide](https://developer.android.com/guide/topics/ui/accessibility)