diff --git a/content/base/public/nsIDocument.h b/content/base/public/nsIDocument.h
index 6989cdba4996..6ec20566248e 100644
--- a/content/base/public/nsIDocument.h
+++ b/content/base/public/nsIDocument.h
@@ -535,6 +535,9 @@ public:
   }
 
   virtual void Reset(nsIChannel* aChannel, nsILoadGroup* aLoadGroup) = 0;
+  /**
+   * Reset this document to aURI and aLoadGroup.  aURI must not be null.
+   */
   virtual void ResetToURI(nsIURI *aURI, nsILoadGroup* aLoadGroup) = 0;
 
   virtual void AddReference(void *aKey, nsISupports *aReference) = 0;
diff --git a/content/base/src/nsDocument.cpp b/content/base/src/nsDocument.cpp
index 2f3a514d06d7..9a76a396d750 100644
--- a/content/base/src/nsDocument.cpp
+++ b/content/base/src/nsDocument.cpp
@@ -683,6 +683,7 @@ nsDocument::Reset(nsIChannel* aChannel, nsILoadGroup* aLoadGroup)
 void
 nsDocument::ResetToURI(nsIURI *aURI, nsILoadGroup *aLoadGroup)
 {
+  NS_PRECONDITION(aURI, "Null URI passed to ResetToURI");
   mDocumentTitle.Truncate();
 
   mPrincipal = nsnull;
@@ -707,24 +708,9 @@ nsDocument::ResetToURI(nsIURI *aURI, nsILoadGroup *aLoadGroup)
   }
   mChildren.Clear();
 
-  // The stylesheets should forget us
-  PRInt32 indx = mStyleSheets.Count();
-  while (--indx >= 0) {
-    nsIStyleSheet* sheet = mStyleSheets[indx];
-    sheet->SetOwningDocument(nsnull);
-
-    PRBool applicable;
-    sheet->GetApplicable(applicable);
-    if (applicable) {
-      RemoveStyleSheetFromStyleSets(sheet);
-    }
-
-    // XXX Tell observers?
-  }
-
-  // Release all the sheets
-  mStyleSheets.Clear();
-
+  // Reset our stylesheets
+  ResetStylesheetsToURI(aURI);
+  
   // Release the listener manager
   mListenerManager = nsnull;
 
@@ -744,10 +730,60 @@ nsDocument::ResetToURI(nsIURI *aURI, nsILoadGroup *aLoadGroup)
   mLastModified.Truncate();
   mContentType.Truncate();
   mContentLanguage.Truncate();
+  mBaseTarget.Truncate();
 
   mXMLDeclarationBits = 0;
 }
 
+nsresult
+nsDocument::ResetStylesheetsToURI(nsIURI* aURI)
+{
+  NS_PRECONDITION(aURI, "Null URI passed to ResetStylesheetsToURI");
+  
+  // The stylesheets should forget us
+  PRInt32 indx = mStyleSheets.Count();
+  while (--indx >= 0) {
+    nsIStyleSheet* sheet = mStyleSheets[indx];
+    sheet->SetOwningDocument(nsnull);
+
+    PRBool applicable;
+    sheet->GetApplicable(applicable);
+    if (applicable) {
+      RemoveStyleSheetFromStyleSets(sheet);
+    }
+
+    // XXX Tell observers?
+  }
+
+  // Release all the sheets
+  mStyleSheets.Clear();
+
+  // Now reset our inline style and attribute sheets.  Note that we
+  // already set their owning document to null in the loop above, but
+  // we'll reset it when we call AddStyleSheet on them.
+  nsresult rv;
+  if (mAttrStyleSheet) {
+    rv = mAttrStyleSheet->Reset(aURI);
+  } else {
+    rv = NS_NewHTMLStyleSheet(getter_AddRefs(mAttrStyleSheet), aURI, this);
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
+  
+  AddStyleSheet(mAttrStyleSheet, 0);
+
+  if (mStyleAttrStyleSheet) {
+    rv = mStyleAttrStyleSheet->Reset(aURI);
+  } else {
+    rv = NS_NewHTMLCSSStyleSheet(getter_AddRefs(mStyleAttrStyleSheet), aURI,
+                                                this);
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  AddStyleSheet(mStyleAttrStyleSheet, 0);
+
+  return rv;
+}
+
 nsresult
 nsDocument::StartDocumentLoad(const char* aCommand, nsIChannel* aChannel,
                               nsILoadGroup* aLoadGroup,
@@ -870,12 +906,13 @@ nsDocument::SetBaseURI(nsIURI* aURI)
 void
 nsDocument::GetBaseTarget(nsAString &aBaseTarget) const
 {
-  aBaseTarget.Truncate();
+  aBaseTarget.Assign(mBaseTarget);
 }
 
 void
 nsDocument::SetBaseTarget(const nsAString &aBaseTarget)
 {
+  mBaseTarget.Assign(aBaseTarget);
 }
 
 void
diff --git a/content/base/src/nsDocument.h b/content/base/src/nsDocument.h
index 3aafe324d074..1bbd71aa7d6a 100644
--- a/content/base/src/nsDocument.h
+++ b/content/base/src/nsDocument.h
@@ -563,6 +563,8 @@ protected:
                          nsCompatibility aCompatMode,
                          nsIPresShell** aInstancePtrResult);
 
+  nsresult ResetStylesheetsToURI(nsIURI* aURI);
+
   nsresult CreateElement(nsINodeInfo *aNodeInfo, nsIDOMElement** aResult);
 
   nsDocument();
@@ -614,6 +616,8 @@ protected:
 
   nsCOMPtr<nsIScriptEventManager> mScriptEventManager;
 
+  nsString mBaseTarget;
+
 private:
   nsresult IsAllowedAsChild(PRUint16 aNodeType, nsIContent* aRefContent);
 
diff --git a/content/html/document/src/nsHTMLDocument.cpp b/content/html/document/src/nsHTMLDocument.cpp
index 7e81e1c457d4..ea94e3b94e94 100644
--- a/content/html/document/src/nsHTMLDocument.cpp
+++ b/content/html/document/src/nsHTMLDocument.cpp
@@ -380,13 +380,7 @@ nsHTMLDocument::ResetToURI(nsIURI *aURI, nsILoadGroup *aLoadGroup)
   mLoadFlags = nsIRequest::LOAD_NORMAL;
 
   nsDocument::ResetToURI(aURI, aLoadGroup);
-  BaseResetToURI(aURI);
-}
 
-
-void
-nsHTMLDocument::BaseResetToURI(nsIURI *aURI)
-{
   nsresult rv = NS_OK;
 
   InvalidateHashTables();
@@ -403,38 +397,11 @@ nsHTMLDocument::BaseResetToURI(nsIURI *aURI)
   mImageMaps.Clear();
   mForms = nsnull;
 
-  if (aURI) {
-    if (!mAttrStyleSheet) {
-      rv = NS_NewHTMLStyleSheet(getter_AddRefs(mAttrStyleSheet), aURI, this);
-    }
-    else {
-      rv = mAttrStyleSheet->Reset(aURI);
-    }
-    if (NS_SUCCEEDED(rv)) {
-      // tell the world about our new style sheet
-      AddStyleSheet(mAttrStyleSheet, 0);
-
-      if (!mStyleAttrStyleSheet) {
-        rv = NS_NewHTMLCSSStyleSheet(getter_AddRefs(mStyleAttrStyleSheet),
-                                     aURI, this);
-      }
-      else {
-        rv = mStyleAttrStyleSheet->Reset(aURI);
-      }
-      if (NS_SUCCEEDED(rv)) {
-        // tell the world about our new style sheet
-        AddStyleSheet(mStyleAttrStyleSheet, 0);
-      }
-    }
-  }
-
   NS_ASSERTION(!mWyciwygChannel,
                "nsHTMLDocument::Reset() - Wyciwyg Channel  still exists!");
 
   mWyciwygChannel = nsnull;
 
-  mBaseTarget.Truncate();
-
   // Make the content type default to "text/html", we are a HTML
   // document, after all. Once we start getting data, this may be
   // changed.
@@ -1233,18 +1200,6 @@ nsHTMLDocument::InternalGetNumberOfStyleSheets() const
   return count;
 }
 
-void
-nsHTMLDocument::GetBaseTarget(nsAString& aTarget) const
-{
-  aTarget.Assign(mBaseTarget);
-}
-
-void
-nsHTMLDocument::SetBaseTarget(const nsAString& aTarget)
-{
-  mBaseTarget = aTarget;
-}
-
 NS_IMETHODIMP
 nsHTMLDocument::SetReferrer(const nsAString& aReferrer)
 {
diff --git a/content/html/document/src/nsHTMLDocument.h b/content/html/document/src/nsHTMLDocument.h
index a2c720b1db81..41bfaf601701 100644
--- a/content/html/document/src/nsHTMLDocument.h
+++ b/content/html/document/src/nsHTMLDocument.h
@@ -113,9 +113,6 @@ public:
 
   virtual nsICSSLoader* GetCSSLoader();
 
-  virtual void GetBaseTarget(nsAString& aTarget) const;
-  virtual void SetBaseTarget(const nsAString& aTarget);
-
   NS_IMETHOD SetReferrer(const nsAString& aReferrer);
 
   NS_IMETHOD GetCompatibilityMode(nsCompatibility& aMode);
@@ -259,11 +256,8 @@ protected:
   nsresult CreateAndAddWyciwygChannel(void);
   nsresult RemoveWyciwygChannel(void);
 
-  void BaseResetToURI(nsIURI* aURI);
-
   virtual void RetrieveRelevantHeaders(nsIChannel *aChannel);
 
-  nsString mBaseTarget;
   nsString mReferrer;
 
   nsCOMPtr<nsIChannel>     mChannel;
diff --git a/content/xml/document/src/nsXMLDocument.cpp b/content/xml/document/src/nsXMLDocument.cpp
index cae09f74f5fc..adb854536876 100644
--- a/content/xml/document/src/nsXMLDocument.cpp
+++ b/content/xml/document/src/nsXMLDocument.cpp
@@ -226,16 +226,6 @@ void
 nsXMLDocument::Reset(nsIChannel* aChannel, nsILoadGroup* aLoadGroup)
 {
   nsDocument::Reset(aChannel, aLoadGroup);
-  nsCOMPtr<nsIURI> url;
-  if (aChannel) {
-    nsresult result = aChannel->GetURI(getter_AddRefs(url));
-    if (NS_FAILED(result))
-      return;
-  }
-
-  SetDefaultStylesheets(url);
-
-  mBaseTarget.Truncate();
 
   mScriptContext = nsnull;
 }
@@ -1027,48 +1017,6 @@ nsXMLDocument::GetElementById(const nsAString& aElementId,
   return CallQueryInterface(content, aReturn);
 }
 
-nsresult
-nsXMLDocument::SetDefaultStylesheets(nsIURI* aUrl)
-{
-  if (!aUrl) {
-    return NS_OK;
-  }
-
-  // XXXbz this code is very similar to the HTMLDocument code; should merge!
-  if (mAttrStyleSheet) {
-    mAttrStyleSheet->SetOwningDocument(nsnull);
-  }
-  if (mStyleAttrStyleSheet) {
-    mStyleAttrStyleSheet->SetOwningDocument(nsnull);
-  }
-
-  nsresult rv = NS_NewHTMLStyleSheet(getter_AddRefs(mAttrStyleSheet), aUrl,
-                                     this);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  rv = NS_NewHTMLCSSStyleSheet(getter_AddRefs(mStyleAttrStyleSheet), aUrl,
-                               this);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  // tell the world about our new style sheets
-  AddStyleSheet(mAttrStyleSheet, 0);
-  AddStyleSheet(mStyleAttrStyleSheet, 0);
-
-  return rv;
-}
-
-void
-nsXMLDocument::SetBaseTarget(const nsAString &aBaseTarget)
-{
-  mBaseTarget.Assign(aBaseTarget);
-}
-
-void
-nsXMLDocument::GetBaseTarget(nsAString &aBaseTarget) const
-{
-  aBaseTarget.Assign(mBaseTarget);
-}
-
 nsICSSLoader*
 nsXMLDocument::GetCSSLoader()
 {
diff --git a/content/xml/document/src/nsXMLDocument.h b/content/xml/document/src/nsXMLDocument.h
index a2d598d112db..614783a86b89 100644
--- a/content/xml/document/src/nsXMLDocument.h
+++ b/content/xml/document/src/nsXMLDocument.h
@@ -78,9 +78,6 @@ public:
 
   virtual void EndLoad();
 
-  virtual void GetBaseTarget(nsAString &aBaseTarget) const;
-  virtual void SetBaseTarget(const nsAString &aBaseTarget);
-
   // nsIDOMNode interface
   NS_IMETHOD CloneNode(PRBool aDeep, nsIDOMNode** aReturn);
 
@@ -127,13 +124,10 @@ protected:
 
   virtual nsresult GetLoadGroup(nsILoadGroup **aLoadGroup);
 
-  nsresult SetDefaultStylesheets(nsIURI* aUrl);
-
   // For additional catalog sheets (if any) needed to layout the XML vocabulary
   // of the document. Catalog sheets are kept at the beginning of our array of
   // style sheets and this counter is used as an offset to distinguish them
   PRInt32 mCatalogSheetCount;
-  nsString mBaseTarget;
 
   nsCOMPtr<nsIEventQueueService> mEventQService;
 
diff --git a/content/xul/document/public/nsIXULDocument.h b/content/xul/document/public/nsIXULDocument.h
index 05a8233e39eb..6a3c3b959c45 100644
--- a/content/xul/document/public/nsIXULDocument.h
+++ b/content/xul/document/public/nsIXULDocument.h
@@ -123,11 +123,6 @@ public:
    */
   NS_IMETHOD SetCurrentPrototype(nsIXULPrototypeDocument* aDocument) = 0;
 
-  /**
-   * Load inline and attribute style sheets
-   */
-  NS_IMETHOD PrepareStyleSheets(nsIURI* aURI) = 0;
-
   /**
    * Notify the XUL document that a subtree has been added
    */
diff --git a/content/xul/document/src/nsXULDocument.cpp b/content/xul/document/src/nsXULDocument.cpp
index e84b78908989..b4b9a4853589 100644
--- a/content/xul/document/src/nsXULDocument.cpp
+++ b/content/xul/document/src/nsXULDocument.cpp
@@ -525,42 +525,6 @@ nsXULDocument::SetContentType(const nsAString& aContentType)
     // application/vnd.mozilla.xul+xml
 }
 
-NS_IMETHODIMP
-nsXULDocument::PrepareStyleSheets(nsIURI* anURL)
-{
-    nsresult rv;
-
-    // XXXbz this is similar to code in nsHTMLDocument and
-    // nsXMLDocument; move up to nsDocument?
-    // Delete references to style sheets - this should be done in superclass...
-    PRInt32 i = mStyleSheets.Count();
-    while (--i >= 0) {
-        mStyleSheets.ObjectAt(i)->SetOwningDocument(nsnull);
-    }
-    mStyleSheets.Clear();
-
-    // Create an HTML style sheet for the HTML content.
-    rv = NS_NewHTMLStyleSheet(getter_AddRefs(mAttrStyleSheet), anURL, this);
-    if (NS_FAILED(rv)) {
-        NS_ERROR("unable to add HTML style sheet");
-        return rv;
-    }
-
-    AddStyleSheet(mAttrStyleSheet, 0);
-
-    // Create an inline style sheet for inline content that contains a style
-    // attribute.
-    rv = NS_NewHTMLCSSStyleSheet(getter_AddRefs(mStyleAttrStyleSheet), anURL, this);
-    if (NS_FAILED(rv)) {
-        NS_ERROR("unable to add inline style sheet");
-        return rv;
-    }
-
-    AddStyleSheet(mStyleAttrStyleSheet, 0);
-
-    return NS_OK;
-}
-
 nsresult
 nsXULDocument::StartDocumentLoad(const char* aCommand, nsIChannel* aChannel,
                                  nsILoadGroup* aLoadGroup,
@@ -575,7 +539,7 @@ nsXULDocument::StartDocumentLoad(const char* aCommand, nsIChannel* aChannel,
     nsresult rv = aChannel->GetOriginalURI(getter_AddRefs(mDocumentURI));
     if (NS_FAILED(rv)) return rv;
 
-    rv = PrepareStyleSheets(mDocumentURI);
+    rv = ResetStylesheetsToURI(mDocumentURI);
     if (NS_FAILED(rv)) return rv;
 
     RetrieveRelevantHeaders(aChannel);
diff --git a/content/xul/document/src/nsXULDocument.h b/content/xul/document/src/nsXULDocument.h
index 165820770291..458df62a4ae6 100644
--- a/content/xul/document/src/nsXULDocument.h
+++ b/content/xul/document/src/nsXULDocument.h
@@ -146,7 +146,6 @@ public:
     NS_IMETHOD SetMasterPrototype(nsIXULPrototypeDocument* aDocument);
     NS_IMETHOD GetMasterPrototype(nsIXULPrototypeDocument** aDocument);
     NS_IMETHOD SetCurrentPrototype(nsIXULPrototypeDocument* aDocument);
-    NS_IMETHOD PrepareStyleSheets(nsIURI* anURL);
     NS_IMETHOD AddSubtreeToDocument(nsIContent* aElement);
     NS_IMETHOD RemoveSubtreeFromDocument(nsIContent* aElement);
     NS_IMETHOD SetTemplateBuilderFor(nsIContent* aContent,