diff --git a/markitect/plugins/testdrive_jsui.py b/markitect/plugins/testdrive_jsui.py
index 29027440..c5756b1f 100644
--- a/markitect/plugins/testdrive_jsui.py
+++ b/markitect/plugins/testdrive_jsui.py
@@ -50,7 +50,7 @@ class TestDriveJSUIEngine(RenderingEnginePlugin):
                 "static/js/controls/debug-control.js",
                 "static/js/controls/edit-control.js",
                 "static/js/config-loader.js",
-                "static/js/main.js"
+                "static/js/main-updated.js"
             ],
             "css": [
                 "static/css/editor.css",
diff --git a/test_browser_ready.py b/test_browser_ready.py
new file mode 100644
index 00000000..a1464085
--- /dev/null
+++ b/test_browser_ready.py
@@ -0,0 +1,134 @@
+#!/usr/bin/env python3
+"""
+Create a browser-ready test file to verify JavaScript fixes
+"""
+
+import sys
+from pathlib import Path
+
+# Add current directory to path for imports
+sys.path.insert(0, str(Path(__file__).parent))
+
+def create_browser_test():
+    """Create a complete test file ready for browser verification."""
+
+    print("🌐 Creating Browser-Ready Test")
+    print("=" * 50)
+
+    try:
+        from markitect.plugins import PluginManager, RenderingEngineManager, RenderingConfig
+
+        # Initialize plugin system
+        plugin_manager = PluginManager()
+        rendering_manager = RenderingEngineManager(plugin_manager)
+        engine = rendering_manager.get_engine('testdrive-jsui')
+
+        # Test content specifically for JavaScript verification
+        test_content = """# JavaScript Fix Verification
+
+This document tests the resolved JavaScript issues:
+
+## Fixed Issues ✅
+
+### 1. Const Redeclaration Error
+- **Problem**: `const MARKITECT_STRICT_MODE` declared in both `main.js` and `control-base.js`
+- **Solution**: Removed duplicate declaration from `control-base.js`, now declared only in `main-updated.js`
+
+### 2. MarkitectMain Not Available
+- **Problem**: Loading `main.js` instead of `main-updated.js` which contains `MarkitectMain`
+- **Solution**: Updated plugin asset list to load `main-updated.js`
+
+### 3. JavaScript Loading Order
+- **Problem**: Multiple main files causing conflicts
+- **Solution**: Load only `main-updated.js` with all required functionality
+
+## Expected Browser Behavior
+
+When you open this document in a browser:
+
+1. ✅ **No console errors** about const redeclaration
+2. ✅ **MarkitectMain available** - edit functionality should work
+3. ✅ **Control panels should appear** in compass positions:
+   - Northwest: Table of Contents
+   - Northeast: Edit Controls
+   - East: Status Information
+   - Southeast: Debug Panel
+
+## Test Instructions
+
+1. Open this HTML file in a browser
+2. Check the browser console (F12 → Console tab)
+3. Look for:
+   - ❌ No "redeclaration of const" errors
+   - ✅ "🎯 TestDrive JSUI loading complete, initializing..."
+   - ✅ "🚀 Starting MarkitectMain initialization..."
+   - ✅ Various initialization success messages
+
+## Interactive Testing
+
+Try clicking on different sections of this document - they should become editable if JavaScript is working correctly.
+
+---
+
+**Generated**: {timestamp}
+**Engine**: testdrive-jsui
+**Assets**: All plugin assets deployed to `_markitect/plugins/testdrive-jsui/`
+"""
+
+        # Create output directory
+        output_dir = Path('/tmp/browser_test_verification')
+        output_dir.mkdir(exist_ok=True)
+
+        print(f"📁 Output directory: {output_dir}")
+
+        # Configure rendering
+        config = RenderingConfig(
+            asset_base_url="_markitect",
+            development_mode=False,
+            output_directory=output_dir
+        )
+
+        # Deploy assets
+        print(f"📦 Deploying assets...")
+        deployed_assets = rendering_manager.deploy_engine_assets('testdrive-jsui', config)
+
+        asset_count = sum(len(files) for files in deployed_assets.values() if isinstance(files, list))
+        print(f"   ✅ Deployed {asset_count} assets")
+
+        # Add timestamp to content
+        from datetime import datetime
+        timestamped_content = test_content.format(
+            timestamp=datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        )
+
+        # Render document
+        print(f"📄 Rendering test document...")
+        html_content = engine.render_document(timestamped_content, 'edit', config)
+
+        # Write test file
+        test_file = output_dir / 'browser_verification_test.html'
+        test_file.write_text(html_content)
+
+        print(f"✅ Browser test file created!")
+        print(f"\n🎯 Instructions:")
+        print(f"1. Open: file://{test_file.absolute()}")
+        print(f"2. Check browser console for errors")
+        print(f"3. Look for edit functionality (click sections to edit)")
+        print(f"4. Control panels should appear around the document")
+
+        print(f"\n📊 File Details:")
+        print(f"   Size: {len(html_content):,} characters")
+        print(f"   Assets: {asset_count} files deployed")
+        print(f"   Location: {test_file}")
+
+        return True
+
+    except Exception as e:
+        print(f"❌ Browser test creation failed: {e}")
+        import traceback
+        traceback.print_exc()
+        return False
+
+if __name__ == "__main__":
+    success = create_browser_test()
+    sys.exit(0 if success else 1)
\ No newline at end of file
diff --git a/test_js_fixes.py b/test_js_fixes.py
new file mode 100644
index 00000000..2d9070b0
--- /dev/null
+++ b/test_js_fixes.py
@@ -0,0 +1,140 @@
+#!/usr/bin/env python3
+"""
+Test JavaScript fixes for const redeclaration and MarkitectMain issues
+"""
+
+import sys
+from pathlib import Path
+import re
+
+# Add current directory to path for imports
+sys.path.insert(0, str(Path(__file__).parent))
+
+def test_javascript_fixes():
+    """Test that JavaScript const redeclaration and MarkitectMain issues are resolved."""
+
+    print("🔧 Testing JavaScript Fixes")
+    print("=" * 50)
+
+    try:
+        # Test 1: Check for const declarations in loaded files
+        print("1️⃣ Checking for const declaration conflicts...")
+
+        from markitect.plugins import PluginManager, RenderingEngineManager
+        plugin_manager = PluginManager()
+        rendering_manager = RenderingEngineManager(plugin_manager)
+        engine = rendering_manager.get_engine('testdrive-jsui')
+
+        required_assets = engine.get_required_assets()
+        js_files = required_assets.get('js', [])
+
+        print(f"   📄 JavaScript files to be loaded: {len(js_files)}")
+
+        const_declarations = {}
+        for js_file in js_files:
+            file_path = Path('testdrive-jsui') / js_file
+            if file_path.exists():
+                content = file_path.read_text()
+                # Find const declarations (both all-caps and camelCase)
+                const_matches = re.findall(r'^const\s+([A-Za-z_][A-Za-z0-9_]*)\s*=', content, re.MULTILINE)
+                if const_matches:
+                    const_declarations[js_file] = const_matches
+                    print(f"      {js_file}: {', '.join(const_matches)}")
+
+        # Check for duplicates
+        all_consts = []
+        for file, consts in const_declarations.items():
+            all_consts.extend(consts)
+
+        duplicates = set([const for const in all_consts if all_consts.count(const) > 1])
+
+        if duplicates:
+            print(f"   ❌ Found duplicate const declarations: {', '.join(duplicates)}")
+            return False
+        else:
+            print(f"   ✅ No duplicate const declarations found")
+
+        # Test 2: Verify MarkitectMain is in the loaded files
+        print(f"\n2️⃣ Checking MarkitectMain availability...")
+
+        markitect_main_files = [f for f, consts in const_declarations.items() if 'MarkitectMain' in consts]
+
+        if not markitect_main_files:
+            print(f"   ❌ MarkitectMain not found in any loaded files")
+            return False
+        elif len(markitect_main_files) > 1:
+            print(f"   ❌ MarkitectMain declared in multiple files: {', '.join(markitect_main_files)}")
+            return False
+        else:
+            print(f"   ✅ MarkitectMain found in: {markitect_main_files[0]}")
+
+        # Test 3: Verify correct main file is loaded
+        print(f"\n3️⃣ Checking correct main file is loaded...")
+
+        if 'static/js/main-updated.js' in js_files and 'static/js/main.js' not in js_files:
+            print(f"   ✅ Correct main file loaded: main-updated.js")
+        elif 'static/js/main.js' in js_files:
+            print(f"   ❌ Wrong main file loaded: main.js (should be main-updated.js)")
+            return False
+        else:
+            print(f"   ⚠️ No main file found in asset list")
+
+        # Test 4: Generate and verify HTML output
+        print(f"\n4️⃣ Testing HTML generation...")
+
+        from markitect.plugins import RenderingConfig
+
+        content = "# JavaScript Fix Test\n\nTesting resolved JavaScript issues."
+        output_dir = Path('/tmp/test_js_fixes_verification')
+        output_dir.mkdir(exist_ok=True)
+
+        config = RenderingConfig(
+            asset_base_url="_markitect",
+            development_mode=False,
+            output_directory=output_dir
+        )
+
+        # Deploy assets and render
+        rendering_manager.deploy_engine_assets('testdrive-jsui', config)
+        html_content = engine.render_document(content, 'edit', config)
+
+        # Check HTML script references
+        script_refs = re.findall(r'<script src="([^"]*)"', html_content)
+        main_scripts = [ref for ref in script_refs if 'main' in ref]
+
+        print(f"   📜 Script references found: {len(script_refs)}")
+        print(f"   🎯 Main script references: {main_scripts}")
+
+        if any('main-updated.js' in ref for ref in main_scripts):
+            print(f"   ✅ Correct main script referenced in HTML")
+        else:
+            print(f"   ❌ main-updated.js not found in HTML script references")
+            return False
+
+        if any('main.js' in ref and 'main-updated.js' not in ref for ref in main_scripts):
+            print(f"   ❌ Incorrect main.js reference found in HTML")
+            return False
+
+        # Save test file
+        test_file = output_dir / 'js_fixes_test.html'
+        test_file.write_text(html_content)
+
+        print(f"\n🎉 JavaScript fixes verification completed successfully!")
+        print(f"\n📊 Summary:")
+        print(f"   ✅ No const declaration conflicts")
+        print(f"   ✅ MarkitectMain properly declared once")
+        print(f"   ✅ Correct main-updated.js file loaded")
+        print(f"   ✅ HTML references correct scripts")
+        print(f"   🌐 Test file: file://{test_file.absolute()}")
+
+        return True
+
+    except Exception as e:
+        print(f"❌ JavaScript fixes test failed: {e}")
+        import traceback
+        traceback.print_exc()
+        return False
+
+if __name__ == "__main__":
+    success = test_javascript_fixes()
+    sys.exit(0 if success else 1)
\ No newline at end of file
diff --git a/testdrive-jsui/static/js/controls/control-base.js b/testdrive-jsui/static/js/controls/control-base.js
index aa7b0e65..07e64730 100644
--- a/testdrive-jsui/static/js/controls/control-base.js
+++ b/testdrive-jsui/static/js/controls/control-base.js
@@ -5,12 +5,7 @@
  */
 
 // Development mode detection (must match main.js)
-const MARKITECT_STRICT_MODE = (
-    window.location.hostname === 'localhost' ||
-    window.location.hostname === '127.0.0.1' ||
-    window.location.search.includes('strict=true') ||
-    window.markitectStrictMode === true
-);
+// MARKITECT_STRICT_MODE is declared in main.js
 
 const Control = {
     // Default configuration
diff --git a/testdrive-jsui/static/js/main-updated.js b/testdrive-jsui/static/js/main-updated.js
index b658c45d..807d0b27 100644
--- a/testdrive-jsui/static/js/main-updated.js
+++ b/testdrive-jsui/static/js/main-updated.js
@@ -6,6 +6,14 @@
  * Implements graceful degradation for missing dependencies
  */
 
+// Development mode detection
+const MARKITECT_STRICT_MODE = (
+    window.location.hostname === 'localhost' ||
+    window.location.hostname === '127.0.0.1' ||
+    window.location.search.includes('strict=true') ||
+    window.markitectStrictMode === true
+);
+
 // Main application module
 const MarkitectMain = {
     initialized: false,