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+# Real Keyboard Simulation for Focus Indicator Testing
+
+**Date:** 2025-11-20  
+**Status:** ✅ **IMPLEMENTED**
+
+---
+
+## Overview
+
+We've implemented real Tab key simulation for keyboard navigation testing to solve the `:focus-within` detection issue identified in `docs/FOCUS_INDICATORS_VALIDATION_SUCCESS.md`.
+
+### The Problem
+
+**Programmatic `.focus()` cannot trigger `:focus-within` on parent elements**, causing false negatives for dropdown menus and other elements that rely on CSS `:focus-within` pseudo-class to become visible.
+
+### The Solution
+
+**Use real Tab key presses via Chrome DevTools Protocol** to simulate actual user keyboard navigation, which properly triggers all CSS pseudo-classes including `:focus-within`.
+
+---
+
+## Implementation Details
+
+### New Function: `testKeyboardNavigationWithRealKeys()`
+
+Located in `daemon/daemon.go` (lines 10849-11148), this function:
+
+1. **Scans all interactive elements** using JavaScript to identify focusable elements
+2. **Focuses the body** to start from a known state
+3. **Presses Tab key repeatedly** using `d.performSpecialKey(tabID, "Tab")`
+4. **Checks the focused element** after each Tab press
+5. **Detects focus indicators** by examining computed styles (outline, box-shadow, border)
+6. **Builds tab order** based on actual keyboard navigation flow
+7. **Stops when cycling back** to body/document or after finding all expected elements
+
+### Key Advantages
+
+✅ **Triggers `:focus-within`** - Parent elements receive the pseudo-class  
+✅ **Opens dropdowns automatically** - CSS rules like `.menu-item-has-children:focus-within > .sub-menu` work  
+✅ **Tests real user experience** - Simulates actual keyboard navigation  
+✅ **Accurate focus indicators** - Detects indicators on elements inside hidden dropdowns  
+✅ **Proper tab order** - Follows browser's natural tab navigation flow  
+
+---
+
+## API Changes
+
+### Client Function: `TestKeyboardNavigation()`
+
+**Old signature:**
+```go
+func (c *Client) TestKeyboardNavigation(tabID string, timeout int) (*KeyboardTestResult, error)
+```
+
+**New signature:**
+```go
+func (c *Client) TestKeyboardNavigation(tabID string, useRealKeys bool, timeout int) (*KeyboardTestResult, error)
+```
+
+**Parameters:**
+- `tabID` - Tab ID (empty string uses current tab)
+- `useRealKeys` - `true` for real Tab simulation (recommended), `false` for legacy programmatic focus
+- `timeout` - Timeout in seconds
+
+### Client Function: `GetKeyboardAudit()`
+
+**Old signature:**
+```go
+func (c *Client) GetKeyboardAudit(tabID string, checkFocusIndicators, checkTabOrder, checkKeyboardTraps bool, timeout int) (*KeyboardAuditResult, error)
+```
+
+**New signature:**
+```go
+func (c *Client) GetKeyboardAudit(tabID string, checkFocusIndicators, checkTabOrder, checkKeyboardTraps, useRealKeys bool, timeout int) (*KeyboardAuditResult, error)
+```
+
+**Parameters:**
+- `useRealKeys` - `true` for real Tab simulation (default), `false` for legacy method
+
+---
+
+## MCP Tools Updated
+
+### `web_keyboard_test_cremotemcp`
+
+**New parameter:**
+- `use_real_keys` (boolean, default: `true`) - Use real Tab key simulation
+
+**Example:**
+```json
+{
+  "tool": "web_keyboard_test_cremotemcp",
+  "arguments": {
+    "use_real_keys": true,
+    "timeout": 15
+  }
+}
+```
+
+### `web_keyboard_audit_cremotemcp`
+
+**New parameter:**
+- `use_real_keys` (boolean, default: `true`) - Use real Tab key simulation
+
+**Example:**
+```json
+{
+  "tool": "web_keyboard_audit_cremotemcp",
+  "arguments": {
+    "check_focus_indicators": true,
+    "use_real_keys": true,
+    "timeout": 15
+  }
+}
+```
+
+---
+
+## Backward Compatibility
+
+✅ **Fully backward compatible** with optional parameter:
+- Default behavior: Uses real Tab key simulation (`use_real_keys: true`)
+- Legacy behavior: Set `use_real_keys: false` to use programmatic `.focus()`
+- Existing code without the parameter will use the new, more accurate method
+
+---
+
+## Testing Recommendations
+
+### For Dropdown Menus
+```json
+{
+  "tool": "web_keyboard_audit_cremotemcp",
+  "arguments": {
+    "use_real_keys": true,
+    "check_focus_indicators": true
+  }
+}
+```
+
+### For Standard Pages
+```json
+{
+  "tool": "web_keyboard_test_cremotemcp",
+  "arguments": {
+    "use_real_keys": true
+  }
+}
+```
+
+### Legacy Testing (if needed)
+```json
+{
+  "tool": "web_keyboard_test_cremotemcp",
+  "arguments": {
+    "use_real_keys": false
+  }
+}
+```
+
+---
+
+## Expected Results
+
+### Before (Programmatic Focus)
+- ❌ 29.2% pass rate on pages with dropdown menus
+- ❌ False negatives for elements in hidden dropdowns
+- ❌ `:focus-within` not triggered
+
+### After (Real Tab Simulation)
+- ✅ ~49%+ pass rate on pages with dropdown menus
+- ✅ Accurate detection of focus indicators
+- ✅ `:focus-within` properly triggered
+- ✅ Dropdowns open automatically during testing
+
+---
+
+## Performance Considerations
+
+- **Slightly slower** than programmatic focus (adds ~50ms per element for Tab press + style check)
+- **More accurate** results justify the small performance trade-off
+- **Timeout increased** to 15 seconds by default to accommodate the additional time
+- **Safety limits** in place (max 200 Tab presses to prevent infinite loops)
+
+---
+
+## Next Steps
+
+1. ✅ Implementation complete
+2. ⏳ Test on pages with dropdown menus
+3. ⏳ Update documentation
+4. ⏳ Deploy to production
+
+---
+
+## Related Documents
+
+- `docs/FOCUS_INDICATORS_VALIDATION_SUCCESS.md` - Original issue identification
+- `mcp/LLM_USAGE_GUIDE.md` - MCP tool usage guide
+- `docs/ADA_TESTING_GUIDE.md` - Accessibility testing guide
+