--- a/dom/base/Attr.cpp
+++ b/dom/base/Attr.cpp
@@ -277,16 +277,17 @@ void
 Attr::GetTextContentInternal(nsAString& aTextContent,
                              OOMReporter& aError)
 {
   GetValue(aTextContent);
 }
 
 void
 Attr::SetTextContentInternal(const nsAString& aTextContent,
+                             nsIPrincipal* aSubjectPrincipal,
                              ErrorResult& aError)
 {
   SetNodeValueInternal(aTextContent, aError);
 }
 
 NS_IMETHODIMP
 Attr::GetIsId(bool* aReturn)
 {

--- a/dom/base/Attr.h
+++ b/dom/base/Attr.h
@@ -41,16 +41,17 @@ public:
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
 
   // nsIDOMNode interface
   NS_FORWARD_NSIDOMNODE_TO_NSINODE
   virtual void GetTextContentInternal(nsAString& aTextContent,
                                       OOMReporter& aError) override;
   virtual void SetTextContentInternal(const nsAString& aTextContent,
+                                      nsIPrincipal* aSubjectPrincipal,
                                       ErrorResult& aError) override;
   virtual void GetNodeValueInternal(nsAString& aNodeValue) override;
   virtual void SetNodeValueInternal(const nsAString& aNodeValue,
                                     ErrorResult& aError) override;
 
   // nsIDOMAttr interface
   NS_DECL_NSIDOMATTR
 

--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -1349,16 +1349,17 @@ FragmentOrElement::GetTextContentInterna
 {
   if (!nsContentUtils::GetNodeTextContent(this, true, aTextContent, fallible)) {
     aError.ReportOOM();
   }
 }
 
 void
 FragmentOrElement::SetTextContentInternal(const nsAString& aTextContent,
+                                          nsIPrincipal* aSubjectPrincipal,
                                           ErrorResult& aError)
 {
   aError = nsContentUtils::SetNodeTextContent(this, aTextContent, false);
 }
 
 void
 FragmentOrElement::DestroyContent()
 {

--- a/dom/base/FragmentOrElement.h
+++ b/dom/base/FragmentOrElement.h
@@ -121,16 +121,17 @@ public:
   virtual nsIContent *GetChildAt(uint32_t aIndex) const override;
   virtual int32_t IndexOf(const nsINode* aPossibleChild) const override;
   virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
                                  bool aNotify) override;
   virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) override;
   virtual void GetTextContentInternal(nsAString& aTextContent,
                                       mozilla::OOMReporter& aError) override;
   virtual void SetTextContentInternal(const nsAString& aTextContent,
+                                      nsIPrincipal* aSubjectPrincipal,
                                       mozilla::ErrorResult& aError) override;
 
   // nsIContent interface methods
   virtual already_AddRefed<nsINodeList> GetChildren(uint32_t aFilter) override;
   virtual const nsTextFragment *GetText() override;
   virtual uint32_t TextLength() const override;
   virtual nsresult SetText(const char16_t* aBuffer, uint32_t aLength,
                            bool aNotify) override;

--- a/dom/base/nsGenericDOMDataNode.h
+++ b/dom/base/nsGenericDOMDataNode.h
@@ -111,16 +111,17 @@ public:
                                  bool aNotify) override;
   virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) override;
   virtual void GetTextContentInternal(nsAString& aTextContent,
                                       mozilla::OOMReporter& aError) override
   {
     GetNodeValue(aTextContent);
   }
   virtual void SetTextContentInternal(const nsAString& aTextContent,
+                                      nsIPrincipal* aSubjectPrincipal,
                                       mozilla::ErrorResult& aError) override
   {
     // Batch possible DOMSubtreeModified events.
     mozAutoSubtreeModified subtree(OwnerDoc(), nullptr);
     return SetNodeValue(aTextContent, aError);
   }
 
   // Implementation for nsIContent

--- a/dom/base/nsINode.h
+++ b/dom/base/nsINode.h
@@ -1330,24 +1330,36 @@ public:
   // a way to ask an element whether it's an HTMLShadowElement.
   virtual bool IsHTMLShadowElement() const { return false; }
 
   // Elements named <content> may or may not be HTMLContentElement.  This is a
   // way to ask an element whether it's an HTMLContentElement.
   virtual bool IsHTMLContentElement() const { return false; }
 
   void GetTextContent(nsAString& aTextContent,
+                      nsIPrincipal& aSubjectPrincipal,
+                      mozilla::OOMReporter& aError)
+  {
+    GetTextContentInternal(aTextContent, aError);
+  }
+  void GetTextContent(nsAString& aTextContent,
                       mozilla::OOMReporter& aError)
   {
     GetTextContentInternal(aTextContent, aError);
   }
   void SetTextContent(const nsAString& aTextContent,
+                      nsIPrincipal& aSubjectPrincipal,
                       mozilla::ErrorResult& aError)
   {
-    SetTextContentInternal(aTextContent, aError);
+    SetTextContentInternal(aTextContent, &aSubjectPrincipal, aError);
+  }
+  void SetTextContent(const nsAString& aTextContent,
+                      mozilla::ErrorResult& aError)
+  {
+    SetTextContentInternal(aTextContent, nullptr, aError);
   }
 
   mozilla::dom::Element* QuerySelector(const nsAString& aSelector,
                                        mozilla::ErrorResult& aResult);
   already_AddRefed<nsINodeList> QuerySelectorAll(const nsAString& aSelector,
                                                  mozilla::ErrorResult& aResult);
 
 protected:
@@ -1988,16 +2000,17 @@ protected:
   virtual bool IsEditableExternal() const
   {
     return IsEditableInternal();
   }
 
   virtual void GetTextContentInternal(nsAString& aTextContent,
                                       mozilla::OOMReporter& aError);
   virtual void SetTextContentInternal(const nsAString& aTextContent,
+                                      nsIPrincipal* aSubjectPrincipal,
                                       mozilla::ErrorResult& aError)
   {
   }
 
 #ifdef DEBUG
   // Note: virtual so that IsInNativeAnonymousSubtree can be called accross
   // module boundaries.
   virtual void CheckNotNativeAnonymous() const;

--- a/dom/webidl/Node.webidl
+++ b/dom/webidl/Node.webidl
@@ -54,17 +54,17 @@ interface Node : EventTarget {
   readonly attribute Node? lastChild;
   [Pure]
   readonly attribute Node? previousSibling;
   [Pure]
   readonly attribute Node? nextSibling;
 
   [CEReactions, SetterThrows, Pure]
            attribute DOMString? nodeValue;
-  [CEReactions, SetterThrows, GetterCanOOM, Pure]
+  [CEReactions, SetterThrows, GetterCanOOM, NeedsSubjectPrincipal, Pure]
            attribute DOMString? textContent;
   [CEReactions, Throws]
   Node insertBefore(Node node, Node? child);
   [CEReactions, Throws]
   Node appendChild(Node node);
   [CEReactions, Throws]
   Node replaceChild(Node node, Node child);
   [CEReactions, Throws]