Closes #429. This should actually resolve the issue by simply removing the potential race condition entirely.

AppKit/Platform/DOM/CPPlatform.j

@@ -24,7 +24,8 @@ CPPlatformDidClearBodyElementNotification   = @"CPPlatformDidClearBodyElementNot
 CPPlatformWillClearBodyElementNotification  = @"CPPlatformWillClearBodyElementNotification";
 
 var screenNeedsInitialization   = NO,
-    mainBodyElement = nil;
+    mainBodyElement = nil,
+    elementRemovalTest = new RegExp("\\bcpdontremove\\b", "g");
 
 @implementation CPPlatform : CPBasePlatform
 {
@@ -99,7 +100,16 @@ var screenNeedsInitialization   = NO,
     var bodyElement = [self mainBodyElement];
 
     // Get rid of any of the original contents of the page.
-    bodyElement.innerHTML = "";
+    var children = bodyElement.childNodes,
+        length = children.length;
+
+    while (length--)
+    {
+        var element = children[length];
+        if (!element.className || element.className.match(elementRemovalTest) === null)
+            bodyElement.removeChild(element);
+    }
+
     bodyElement.style.overflow = "hidden";
 
     if (document.documentElement)

AppKit/Platform/DOM/CPPlatformString.j

@@ -33,25 +33,10 @@ var DOMSpanElement      = nil,
 + (void)bootstrap
 {
     [self createDOMElements];
-
-    [[CPNotificationCenter defaultCenter]
-        addObserver:self
-           selector:@selector(platformDidClearBodyElement:)
-               name:CPPlatformDidClearBodyElementNotification
-             object:CPPlatform];
-
-    [[CPNotificationCenter defaultCenter]
-        addObserver:self
-           selector:@selector(platformWillClearBodyElement:)
-               name:CPPlatformWillClearBodyElementNotification
-             object:CPPlatform];
 }
 
 + (void)createDOMElements
 {
-    if (DOMIFrameElement)
-        return;
-
     DOMIFrameElement = document.createElement("iframe");
     // necessary for Safari caching bug:
     DOMIFrameElement.name = "iframe_" + FLOOR(RAND() * 10000);
@@ -63,6 +48,7 @@ var DOMSpanElement      = nil,
     DOMIFrameElement.style.borderWidth = "0px";
     DOMIFrameElement.style.overflow = "hidden";
     DOMIFrameElement.style.zIndex = 100000000000;
+    DOMIFrameElement.className = "cpdontremove";
 
     var bodyElement = [CPPlatform mainBodyElement];
 
@@ -89,27 +75,6 @@ var DOMSpanElement      = nil,
     DOMDivElement.appendChild(DOMSpanElement);
 }
 
-+ (void)removeDOMElements
-{
-    var iframe = DOMIFrameElement,
-        bodyElement = [CPPlatform mainBodyElement];
-
-    DOMIFrameElement = nil;
-    DOMSpanElement = nil;
-
-    bodyElement.removeChild(iframe);
-}
-
-+ (void)platformDidClearBodyElement:(CPNotification)aNotification
-{
-    [self createDOMElements];
-}
-
-+ (void)platformWillClearBodyElement:(CPNotification)aNotification
-{
-    [self removeDOMElements];
-}
-
 + (CGSize)sizeOfString:(CPString)aString withFont:(CPFont)aFont forWidth:(float)aWidth
 {
     if (!aFont)
@@ -120,9 +85,6 @@ var DOMSpanElement      = nil,
         aFont = DefaultFont;
     }
 
-    if (!DOMIFrameElement)
-        [self createDOMElements];
-
     var style = DOMSpanElement.style;
 
     if (!aWidth)

AppKit/Platform/DOM/CPPlatformWindow+DOM.j

@@ -239,6 +239,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
     _DOMFocusElement.style.zIndex = "-1000";
     _DOMFocusElement.style.opacity = "0";
     _DOMFocusElement.style.filter = "alpha(opacity=0)";
+    _DOMFocusElement.className = "cpdontremove";
 
     _DOMBodyElement.appendChild(_DOMFocusElement);
 
@@ -248,6 +249,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
     _DOMPasteboardElement.style.position = "absolute";
     _DOMPasteboardElement.style.top = "-10000px";
     _DOMPasteboardElement.style.zIndex = "999";
+    _DOMPasteboardElement.className = "cpdontremove";
 
     _DOMBodyElement.appendChild(_DOMPasteboardElement);
 
@@ -255,11 +257,6 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
     _DOMPasteboardElement.blur();
 }
 
-- (void)platformDidClearBodyElement:(CPNotification)aNotification
-{
-    [self createDOMElements];
-}
-
 - (void)registerDOMWindow
 {
     var theDocument = _DOMWindow.document;
@@ -273,14 +270,6 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
     _DOMBodyElement.webkitTouchCallout = "none";
 
     [self createDOMElements];
-
-    if (window === _DOMWindow)
-        [[CPNotificationCenter defaultCenter]
-            addObserver:self
-               selector:@selector(platformDidClearBodyElement:)
-                   name:CPPlatformDidClearBodyElementNotification
-                 object:CPPlatform];
-
     [self _addLayers];
 
     var theClass = [self class],