diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index c93e5c2da130..0d8831b8c62c 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -3851,7 +3851,7 @@ nsCSSFrameConstructor::CreateAnonymousFrames(nsFrameConstructorState& aState,
                                              PendingBinding*          aPendingBinding,
                                              nsFrameItems&            aChildItems)
 {
-  nsAutoTArray<nsIContent*, 4> newAnonymousItems;
+  nsAutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> newAnonymousItems;
   nsresult rv = GetAnonymousContent(aParent, aParentFrame, newAnonymousItems);
   NS_ENSURE_SUCCESS(rv, rv);
 
@@ -3868,8 +3868,9 @@ nsCSSFrameConstructor::CreateAnonymousFrames(nsFrameConstructorState& aState,
                "How can that happen if we have nodes to construct frames for?");
 
   for (PRUint32 i=0; i < count; i++) {
-    nsIContent* content = newAnonymousItems[i];
+    nsIContent* content = newAnonymousItems[i].mContent;
     NS_ASSERTION(content, "null anonymous content?");
+    NS_ASSERTION(!newAnonymousItems[i].mStyleContext, "Unexpected style context");
 
     nsIFrame* newFrame = creator->CreateFrameFor(content);
     if (newFrame) {
@@ -3889,7 +3890,7 @@ nsCSSFrameConstructor::CreateAnonymousFrames(nsFrameConstructorState& aState,
 nsresult
 nsCSSFrameConstructor::GetAnonymousContent(nsIContent* aParent,
                                            nsIFrame* aParentFrame,
-                                           nsTArray<nsIContent*>& aContent)
+                                           nsTArray<nsIAnonymousContentCreator::ContentInfo>& aContent)
 {
   nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame);
   if (!creator)
@@ -3901,7 +3902,7 @@ nsCSSFrameConstructor::GetAnonymousContent(nsIContent* aParent,
   PRUint32 count = aContent.Length();
   for (PRUint32 i=0; i < count; i++) {
     // get our child's content and set its parent to our content
-    nsIContent* content = aContent[i];
+    nsIContent* content = aContent[i].mContent;
     NS_ASSERTION(content, "null anonymous content?");
 
     // least-surprise CSS binding until we do the SVG specified
@@ -9534,18 +9535,19 @@ nsCSSFrameConstructor::ProcessChildren(nsFrameConstructorState& aState,
   // Create any anonymous frames we need here.  This must happen before the
   // non-anonymous children are processed to ensure that popups are never
   // constructed before the popupset.
-  nsAutoTArray<nsIContent*, 4> anonymousItems;
+  nsAutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems;
   GetAnonymousContent(aContent, aFrame, anonymousItems);
   for (PRUint32 i = 0; i < anonymousItems.Length(); ++i) {
 #ifdef DEBUG
     nsIAnonymousContentCreator* creator = do_QueryFrame(aFrame);
-    NS_ASSERTION(!creator || !creator->CreateFrameFor(anonymousItems[i]),
+    NS_ASSERTION(!creator ||
+                 !creator->CreateFrameFor(anonymousItems[i].mContent),
                  "If you need to use CreateFrameFor, you need to call "
                  "CreateAnonymousFrames manually and not follow the standard "
                  "ProcessChildren() codepath for this frame");
 #endif
-    AddFrameConstructionItems(aState, anonymousItems[i], PR_TRUE, aFrame,
-                              itemsToConstruct);
+    AddFrameConstructionItems(aState, anonymousItems[i].mContent, PR_TRUE,
+                              aFrame, itemsToConstruct);
   }
 
   if (!aFrame->IsLeaf()) {
diff --git a/layout/base/nsCSSFrameConstructor.h b/layout/base/nsCSSFrameConstructor.h
index 4b8e588dfb11..8c9bd0541f4f 100644
--- a/layout/base/nsCSSFrameConstructor.h
+++ b/layout/base/nsCSSFrameConstructor.h
@@ -53,6 +53,7 @@
 #include "nsPageContentFrame.h"
 #include "nsCSSPseudoElements.h"
 #include "RestyleTracker.h"
+#include "nsIAnonymousContentCreator.h"
 
 class nsIDocument;
 struct nsFrameItems;
@@ -1267,7 +1268,7 @@ private:
 
   nsresult GetAnonymousContent(nsIContent* aParent,
                                nsIFrame* aParentFrame,
-                               nsTArray<nsIContent*>& aAnonContent);
+                               nsTArray<nsIAnonymousContentCreator::ContentInfo>& aAnonContent);
 
 //MathML Mod - RBS
 #ifdef MOZ_MATHML
diff --git a/layout/forms/nsComboboxControlFrame.cpp b/layout/forms/nsComboboxControlFrame.cpp
index 2172a4a4e1c7..f405d91b0e11 100644
--- a/layout/forms/nsComboboxControlFrame.cpp
+++ b/layout/forms/nsComboboxControlFrame.cpp
@@ -991,7 +991,7 @@ nsComboboxControlFrame::GetContentInsertionFrame() {
 }
 
 nsresult
-nsComboboxControlFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsComboboxControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   // The frames used to display the combo box and the button used to popup the dropdown list
   // are created through anonymous content. The dropdown list is not created through anonymous
diff --git a/layout/forms/nsComboboxControlFrame.h b/layout/forms/nsComboboxControlFrame.h
index fd90c98515d3..4cc48fa9c6b7 100644
--- a/layout/forms/nsComboboxControlFrame.h
+++ b/layout/forms/nsComboboxControlFrame.h
@@ -98,7 +98,7 @@ public:
   NS_DECL_FRAMEARENA_HELPERS
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
   virtual nsIFrame* CreateFrameFor(nsIContent* aContent);
diff --git a/layout/forms/nsFileControlFrame.cpp b/layout/forms/nsFileControlFrame.cpp
index 65c9c65a4d91..a57847ebe532 100644
--- a/layout/forms/nsFileControlFrame.cpp
+++ b/layout/forms/nsFileControlFrame.cpp
@@ -218,7 +218,7 @@ PRBool CapturePickerAcceptCallback(const nsAString& aAccept, void* aClosure)
 }
 
 nsresult
-nsFileControlFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsFileControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   // Get the NodeInfoManager and tag necessary to create input elements
   nsCOMPtr<nsIDocument> doc = mContent->GetDocument();
diff --git a/layout/forms/nsFileControlFrame.h b/layout/forms/nsFileControlFrame.h
index 6eb8e10ef540..599a31a92eec 100644
--- a/layout/forms/nsFileControlFrame.h
+++ b/layout/forms/nsFileControlFrame.h
@@ -93,7 +93,7 @@ public:
 
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
diff --git a/layout/forms/nsGfxButtonControlFrame.cpp b/layout/forms/nsGfxButtonControlFrame.cpp
index 1296ce4be583..64cf1575ed54 100644
--- a/layout/forms/nsGfxButtonControlFrame.cpp
+++ b/layout/forms/nsGfxButtonControlFrame.cpp
@@ -112,7 +112,7 @@ nsGfxButtonControlFrame::GetFrameName(nsAString& aResult) const
 // Create the text content used as label for the button.
 // The frame will be generated by the frame constructor.
 nsresult
-nsGfxButtonControlFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsGfxButtonControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   nsXPIDLString label;
   GetLabel(label);
diff --git a/layout/forms/nsGfxButtonControlFrame.h b/layout/forms/nsGfxButtonControlFrame.h
index b3a464108e16..bc3cc6d1c76b 100644
--- a/layout/forms/nsGfxButtonControlFrame.h
+++ b/layout/forms/nsGfxButtonControlFrame.h
@@ -75,7 +75,7 @@ public:
   NS_DECL_QUERYFRAME
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
   virtual nsIFrame* CreateFrameFor(nsIContent* aContent);
diff --git a/layout/forms/nsIsIndexFrame.cpp b/layout/forms/nsIsIndexFrame.cpp
index 336f80a61dac..67b3dcf1e86b 100644
--- a/layout/forms/nsIsIndexFrame.cpp
+++ b/layout/forms/nsIsIndexFrame.cpp
@@ -187,7 +187,7 @@ nsIsIndexFrame::SetFocus(PRBool aOn, PRBool aRepaint)
 }
 
 nsresult
-nsIsIndexFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsIsIndexFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   // Get the node info manager (used to create hr's and input's)
   nsCOMPtr<nsIDocument> doc = mContent->GetDocument();
diff --git a/layout/forms/nsIsIndexFrame.h b/layout/forms/nsIsIndexFrame.h
index b717c6079461..92b408c64a5e 100644
--- a/layout/forms/nsIsIndexFrame.h
+++ b/layout/forms/nsIsIndexFrame.h
@@ -97,7 +97,7 @@ public:
   void           SetFocus(PRBool aOn, PRBool aRepaint);
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
diff --git a/layout/forms/nsTextControlFrame.cpp b/layout/forms/nsTextControlFrame.cpp
index 20c6c00bf359..8567f82d5111 100644
--- a/layout/forms/nsTextControlFrame.cpp
+++ b/layout/forms/nsTextControlFrame.cpp
@@ -391,7 +391,7 @@ nsTextControlFrame::EnsureEditorInitialized()
 }
 
 nsresult
-nsTextControlFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsTextControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   NS_ASSERTION(mContent, "We should have a content!");
 
diff --git a/layout/forms/nsTextControlFrame.h b/layout/forms/nsTextControlFrame.h
index b1b18dece88b..f6e87c6f20f9 100644
--- a/layout/forms/nsTextControlFrame.h
+++ b/layout/forms/nsTextControlFrame.h
@@ -121,7 +121,7 @@ public:
   }
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
diff --git a/layout/generic/nsGfxScrollFrame.cpp b/layout/generic/nsGfxScrollFrame.cpp
index ab4d179dbb64..ccc20b475f17 100644
--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -106,7 +106,7 @@ nsHTMLScrollFrame::nsHTMLScrollFrame(nsIPresShell* aShell, nsStyleContext* aCont
 }
 
 nsresult
-nsHTMLScrollFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsHTMLScrollFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   return mInner.CreateAnonymousContent(aElements);
 }
@@ -1024,7 +1024,7 @@ nsMargin nsGfxScrollFrameInner::GetDesiredScrollbarSizes(nsBoxLayoutState* aStat
 }
 
 nsresult
-nsXULScrollFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsXULScrollFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   return mInner.CreateAnonymousContent(aElements);
 }
@@ -2386,7 +2386,8 @@ nsGfxScrollFrameInner::ReloadChildFrames()
 }
   
 nsresult
-nsGfxScrollFrameInner::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsGfxScrollFrameInner::CreateAnonymousContent(
+  nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements)
 {
   nsPresContext* presContext = mOuter->PresContext();
   nsIFrame* parent = mOuter->GetParent();
diff --git a/layout/generic/nsGfxScrollFrame.h b/layout/generic/nsGfxScrollFrame.h
index 01cdbc0ec4a9..bab8a5cabe8b 100644
--- a/layout/generic/nsGfxScrollFrame.h
+++ b/layout/generic/nsGfxScrollFrame.h
@@ -81,7 +81,8 @@ public:
   // We need this if a scrollbar frame is recreated.
   void ReloadChildFrames();
 
-  nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  nsresult CreateAnonymousContent(
+    nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements);
   void AppendAnonymousContentTo(nsBaseContentList& aElements, PRUint32 aFilter);
   nsresult FireScrollPortEvent();
   void PostOverflowEvent();
@@ -424,7 +425,7 @@ public:
   }
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
@@ -624,7 +625,7 @@ public:
   }
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
diff --git a/layout/generic/nsIAnonymousContentCreator.h b/layout/generic/nsIAnonymousContentCreator.h
index 6f7d65378079..c3391ee17912 100644
--- a/layout/generic/nsIAnonymousContentCreator.h
+++ b/layout/generic/nsIAnonymousContentCreator.h
@@ -45,6 +45,7 @@
 
 #include "nsQueryFrame.h"
 #include "nsIContent.h"
+#include "nsStyleContext.h"
 
 class nsIFrame;
 template <class T, class A> class nsTArray;
@@ -60,6 +61,19 @@ class nsIAnonymousContentCreator
 public:
   NS_DECL_QUERYFRAME_TARGET(nsIAnonymousContentCreator)
 
+  struct ContentInfo {
+    ContentInfo(nsIContent* aContent) :
+      mContent(aContent)
+    {}
+
+    ContentInfo(nsIContent* aContent, nsStyleContext* aStyleContext) :
+      mContent(aContent), mStyleContext(aStyleContext)
+    {}
+
+    nsIContent* mContent;
+    nsRefPtr<nsStyleContext> mStyleContext;
+  };
+
   /**
    * Creates "native" anonymous content and adds the created content to
    * the aElements array. None of the returned elements can be nsnull.
@@ -69,7 +83,7 @@ public:
    *       from CreateAnonymousContent when appropriate (i.e. before releasing
    *       them).
    */
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements)=0;
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements)=0;
 
   /**
    * Appends "native" anonymous children created by CreateAnonymousContent()
diff --git a/layout/generic/nsVideoFrame.cpp b/layout/generic/nsVideoFrame.cpp
index 49a8d3598e2e..c638736970b0 100644
--- a/layout/generic/nsVideoFrame.cpp
+++ b/layout/generic/nsVideoFrame.cpp
@@ -89,7 +89,7 @@ NS_QUERYFRAME_HEAD(nsVideoFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
 
 nsresult
-nsVideoFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsVideoFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   nsNodeInfoManager *nodeInfoManager = GetContent()->GetCurrentDoc()->NodeInfoManager();
   nsCOMPtr<nsINodeInfo> nodeInfo;
diff --git a/layout/generic/nsVideoFrame.h b/layout/generic/nsVideoFrame.h
index a6584cd2dac6..83bcf3088cba 100644
--- a/layout/generic/nsVideoFrame.h
+++ b/layout/generic/nsVideoFrame.h
@@ -103,7 +103,7 @@ public:
     return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
   }
   
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilters);
 
diff --git a/layout/svg/base/src/nsSVGUseFrame.cpp b/layout/svg/base/src/nsSVGUseFrame.cpp
index 110d021c27d1..04b9eec53b39 100644
--- a/layout/svg/base/src/nsSVGUseFrame.cpp
+++ b/layout/svg/base/src/nsSVGUseFrame.cpp
@@ -88,7 +88,7 @@ public:
 #endif
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 };
@@ -171,7 +171,7 @@ nsSVGUseFrame::IsLeaf() const
 // nsIAnonymousContentCreator methods:
 
 nsresult
-nsSVGUseFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsSVGUseFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   nsSVGUseElement *use = static_cast<nsSVGUseElement*>(mContent);
 
diff --git a/layout/xul/base/src/nsDocElementBoxFrame.cpp b/layout/xul/base/src/nsDocElementBoxFrame.cpp
index 3c618df71458..866ef2ce7d80 100644
--- a/layout/xul/base/src/nsDocElementBoxFrame.cpp
+++ b/layout/xul/base/src/nsDocElementBoxFrame.cpp
@@ -71,7 +71,7 @@ public:
   NS_DECL_FRAMEARENA_HELPERS
 
   // nsIAnonymousContentCreator
-  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
+  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements);
   virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                         PRUint32 aFilter);
 
@@ -110,7 +110,7 @@ nsDocElementBoxFrame::DestroyFrom(nsIFrame* aDestructRoot)
 }
 
 nsresult
-nsDocElementBoxFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
+nsDocElementBoxFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
 {
   nsIDocument* doc = mContent->GetDocument();
   if (!doc) {