diff --git a/content/base/public/nsIContent.h b/content/base/public/nsIContent.h
index 03f0d88d07bc..2c0c302942da 100644
--- a/content/base/public/nsIContent.h
+++ b/content/base/public/nsIContent.h
@@ -464,7 +464,9 @@ public:
     /** form controls */
     eHTML_FORM_CONTROL   = 0x00000008,
     /** XUL elements */
-    eXUL                 = 0x00000010
+    eXUL                 = 0x00000010,
+    /** xml processing instructions */
+    ePROCESSING_INSTRUCTION = 0x00000020
   };
 
   /**
diff --git a/content/base/public/nsITextContent.h b/content/base/public/nsITextContent.h
index 3f7302c1993c..c224dc2a3ca7 100644
--- a/content/base/public/nsITextContent.h
+++ b/content/base/public/nsITextContent.h
@@ -102,6 +102,11 @@ public:
    * method allows you to specify whether to copy the text as well.
    */
   NS_IMETHOD CloneContent(PRBool aCloneText, nsITextContent** aClone) = 0;
+
+  /**
+   * Append the text content to aResult.
+   */
+  NS_IMETHOD AppendTextTo(nsAString& aResult) = 0;
 };
 
 //----------------------------------------------------------------------
diff --git a/content/base/src/nsGenericDOMDataNode.cpp b/content/base/src/nsGenericDOMDataNode.cpp
index 22ba80783cee..97af62f3c324 100644
--- a/content/base/src/nsGenericDOMDataNode.cpp
+++ b/content/base/src/nsGenericDOMDataNode.cpp
@@ -1349,6 +1349,21 @@ nsGenericDOMDataNode::CloneContent(PRBool aCloneText, nsITextContent** aClone)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
+NS_IMETHODIMP
+nsGenericDOMDataNode::AppendTextTo(nsAString& aResult)
+{
+  if (mText.Is2b()) {
+    aResult.Append(mText.Get2b(), mText.GetLength());
+  } else {
+    // XXX we would like to have a AppendASCIItoUCS2 here
+    aResult.Append(NS_ConvertASCIItoUCS2(mText.Get1b(),
+                                         mText.GetLength()).get(),
+                   mText.GetLength());
+  }
+
+  return NS_OK;
+}
+
 void
 nsGenericDOMDataNode::LookupListenerManager(nsIEventListenerManager **aListenerManager) const
 {
diff --git a/content/base/src/nsGenericDOMDataNode.h b/content/base/src/nsGenericDOMDataNode.h
index c5ae9890d5e8..35176298279c 100644
--- a/content/base/src/nsGenericDOMDataNode.h
+++ b/content/base/src/nsGenericDOMDataNode.h
@@ -241,6 +241,7 @@ public:
   NS_IMETHOD SetText(const char* aBuffer, PRInt32 aLength, PRBool aNotify);
   NS_IMETHOD IsOnlyWhitespace(PRBool* aResult);
   NS_IMETHOD CloneContent(PRBool aCloneText, nsITextContent** aClone);
+  NS_IMETHOD AppendTextTo(nsAString& aResult);
 
   //----------------------------------------
 
diff --git a/content/html/content/src/nsAttributeContent.cpp b/content/html/content/src/nsAttributeContent.cpp
index ea1d75d6e5f6..5ee1a0ddfae2 100644
--- a/content/html/content/src/nsAttributeContent.cpp
+++ b/content/html/content/src/nsAttributeContent.cpp
@@ -211,7 +211,8 @@ public:
                    PRInt32 aLength,
                    PRBool aNotify);
   NS_IMETHOD IsOnlyWhitespace(PRBool* aResult);
-  NS_IMETHOD CloneContent(PRBool aCloneText, nsITextContent** aClone); 
+  NS_IMETHOD CloneContent(PRBool aCloneText, nsITextContent** aClone);
+  NS_IMETHOD AppendTextTo(nsAString& aResult);
 
   //----------------------------------------
 
@@ -439,7 +440,8 @@ nsAttributeContent::CopyText(nsAString& aResult)
     aResult.Assign(mText.Get2b(), mText.GetLength());
   }
   else {
-    aResult.Assign(NS_ConvertASCIItoUCS2(mText.Get1b(), mText.GetLength()).get(), mText.GetLength());
+    const char *data = mText.Get1b();
+    CopyASCIItoUCS2(Substring(data, data + mText.GetLength()), aResult);
   }
   return NS_OK;
 }
@@ -555,3 +557,20 @@ nsAttributeContent::CloneContent(PRBool aCloneText, nsITextContent** aReturn)
   it->mText = mText;
   return result;
 }
+
+NS_IMETHODIMP
+nsAttributeContent::AppendTextTo(nsAString& aResult)
+{
+  ValidateTextFragment();
+  if (mText.Is2b()) {
+    aResult.Append(mText.Get2b(), mText.GetLength());
+  }
+  else {
+    // XXX we would like to have a AppendASCIItoUCS2 here
+    aResult.Append(NS_ConvertASCIItoUCS2(mText.Get1b(),
+                                         mText.GetLength()).get(),
+                   mText.GetLength());
+  }
+
+  return NS_OK;
+}
diff --git a/content/xml/content/src/nsXMLCDATASection.cpp b/content/xml/content/src/nsXMLCDATASection.cpp
index af0f8b5b2a1d..c7c7fdf64a37 100644
--- a/content/xml/content/src/nsXMLCDATASection.cpp
+++ b/content/xml/content/src/nsXMLCDATASection.cpp
@@ -67,6 +67,7 @@ public:
 
   // nsIContent
   NS_IMETHOD GetTag(nsIAtom** aResult) const;
+  NS_IMETHOD_(PRBool) IsContentOfType(PRUint32 aFlags);
 #ifdef DEBUG
   NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
   NS_IMETHOD DumpContent(FILE* out, PRInt32 aIndent,PRBool aDumpAll) const;
@@ -120,6 +121,12 @@ nsXMLCDATASection::GetTag(nsIAtom** aResult) const
   return NS_OK;
 }
 
+NS_IMETHODIMP_(PRBool)
+nsXMLCDATASection::IsContentOfType(PRUint32 aFlags)
+{
+  return !(aFlags & ~eTEXT);
+}
+
 NS_IMETHODIMP
 nsXMLCDATASection::GetNodeName(nsAString& aNodeName)
 {
diff --git a/content/xml/content/src/nsXMLProcessingInstruction.cpp b/content/xml/content/src/nsXMLProcessingInstruction.cpp
index 8ce6911e3e60..637c244d09d7 100644
--- a/content/xml/content/src/nsXMLProcessingInstruction.cpp
+++ b/content/xml/content/src/nsXMLProcessingInstruction.cpp
@@ -120,6 +120,12 @@ nsXMLProcessingInstruction::GetTag(nsIAtom** aResult) const
   return NS_OK;
 }
 
+NS_IMETHODIMP_(PRBool)
+nsXMLProcessingInstruction::IsContentOfType(PRUint32 aFlags)
+{
+  return !(aFlags & ~ePROCESSING_INSTRUCTION);
+}
+
 NS_IMETHODIMP
 nsXMLProcessingInstruction::GetNodeName(nsAString& aNodeName)
 {
diff --git a/content/xml/content/src/nsXMLProcessingInstruction.h b/content/xml/content/src/nsXMLProcessingInstruction.h
index 4ed62a08ce56..a3424e07b111 100644
--- a/content/xml/content/src/nsXMLProcessingInstruction.h
+++ b/content/xml/content/src/nsXMLProcessingInstruction.h
@@ -65,6 +65,7 @@ public:
 
   // nsIContent
   NS_IMETHOD GetTag(nsIAtom** aResult) const;
+  NS_IMETHOD_(PRBool) IsContentOfType(PRUint32 aFlags);
 
 #ifdef DEBUG
   NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;