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ZOOM_TEST_BUG_FIX.md

@@ -0,0 +1,110 @@
+# Zoom Test Bug Fix
+
+## Issue Summary
+
+**Bug**: The `web_zoom_test_cremotemcp` tool was failing with JSON parsing errors:
+```
+Error: invalid character 'm' looking for beginning of value
+```
+
+**Root Cause**: Unreachable code in the JavaScript evaluation function in `daemon/daemon.go` at line 9375.
+
+## Technical Details
+
+### The Problem
+
+In the `testZoom` function in `daemon/daemon.go` (lines 9312-9376), the JavaScript code had a duplicate return statement:
+
+```javascript
+return {
+    viewport_width: window.innerWidth,
+    viewport_height: window.innerHeight,
+    has_horizontal_scroll: hasHorizontalScroll,
+    content_width: contentWidth,
+    content_height: contentHeight,
+    visible_elements: visibleCount,
+    overflowing_elements: overflowingCount,
+    text_readable: textReadable,
+    min_font_size: minFontSize
+};
+return JSON.stringify(result);  // ← UNREACHABLE CODE - BUG
+```
+
+The second `return JSON.stringify(result);` statement was:
+1. **Unreachable** - came after a valid return statement
+2. **Referenced undefined variable** - `result` doesn't exist in that scope
+3. **Caused malformed output** - the JavaScript engine likely returned undefined or threw an error
+
+This resulted in the Go code receiving malformed data that couldn't be parsed as JSON, causing the error message about invalid character 'm'.
+
+### The Fix
+
+**File**: `daemon/daemon.go`  
+**Line**: 9375 (removed)
+
+Removed the unreachable `return JSON.stringify(result);` statement. The JavaScript now correctly returns the object directly, which the Go code can properly parse.
+
+### Fixed Code
+
+```javascript
+return {
+    viewport_width: window.innerWidth,
+    viewport_height: window.innerHeight,
+    has_horizontal_scroll: hasHorizontalScroll,
+    content_width: contentWidth,
+    content_height: contentHeight,
+    visible_elements: visibleCount,
+    overflowing_elements: overflowingCount,
+    text_readable: textReadable,
+    min_font_size: minFontSize
+};
+// Removed: return JSON.stringify(result);
+```
+
+## Testing
+
+### Build Verification
+```bash
+cd mcp && go build -o cremote-mcp
+```
+✅ Build successful - no compilation errors
+
+### Binary Created
+```
+-rwxrwxr-x 1 squash squash 9.8M Oct  2 13:04 cremote-mcp
+```
+
+## Impact
+
+This fix resolves the zoom test functionality, which is critical for WCAG 1.4.4 and 1.4.10 compliance testing:
+- **WCAG 1.4.4**: Resize text - Users must be able to zoom text to 200% without loss of content or functionality
+- **WCAG 1.4.10**: Reflow - Content must reflow at 400% zoom without horizontal scrolling
+
+## Next Steps
+
+1. **Deploy** the updated MCP binary to the container
+2. **Restart** the cremote daemon to load the new binary
+3. **Resume** the ADA Level AA assessment of https://visionleadership.org
+4. **Verify** zoom test now works correctly at 100%, 200%, and 400% zoom levels
+
+## Related Files
+
+- `daemon/daemon.go` - Main fix location (line 9375 removed)
+- `mcp/main.go` - MCP server tool registration (lines 3793-3890)
+- `client/client.go` - Client-side zoom test interface (lines 3599-3648)
+
+## Commit Message Suggestion
+
+```
+fix: Remove unreachable return statement in zoom test JavaScript
+
+The testZoom function had an unreachable `return JSON.stringify(result);`
+statement after the main return, causing JSON parsing errors. This resulted
+in "invalid character 'm' looking for beginning of value" errors when
+attempting to parse the zoom test results.
+
+Fixes zoom test functionality for WCAG 1.4.4 and 1.4.10 compliance testing.
+
+File: daemon/daemon.go, line 9375
+```
+

daemon/daemon.go

@@ -9372,7 +9372,6 @@ func (d *Daemon) testZoom(tabID string, zoomLevels []float64, timeout int) (*Zoo
 				text_readable: textReadable,
 				min_font_size: minFontSize
 			};
-			return JSON.stringify(result);
 		}`
 
 		var jsResult *proto.RuntimeRemoteObject