1 files changed, 12 insertions, 10 deletions
diff --git a/WebCore/html/HTMLFrameElementBase.h b/WebCore/html/HTMLFrameElementBase.h
index 1b6e2a3..ae41e75 100644
--- a/WebCore/html/HTMLFrameElementBase.h
+++ b/WebCore/html/HTMLFrameElementBase.h
@@ -50,15 +50,10 @@ protected:
     bool isURLAllowed() const;
 
     virtual void parseMappedAttribute(Attribute*);
-
     virtual void insertedIntoDocument();
-    virtual void removedFromDocument();
-
     virtual void attach();
 
 private:
-    virtual bool canLazyAttach() { return false; }
-
     virtual bool supportsFocus() const;
     virtual void setFocus(bool);
     
@@ -67,7 +62,7 @@ private:
     virtual void setName();
 
     virtual void willRemove();
-    void checkAttachedTimerFired(Timer<HTMLFrameElementBase>*);
+    void checkInDocumentTimerFired(Timer<HTMLFrameElementBase>*);
     void updateOnReparenting();
 
     bool viewSourceMode() const { return m_viewSource; }
@@ -85,12 +80,19 @@ private:
     int m_marginWidth;
     int m_marginHeight;
 
-    Timer<HTMLFrameElementBase> m_checkAttachedTimer;
+    // This is a performance optimization some call "magic iframe" which avoids
+    // tearing down the frame hierarchy when a web page calls adoptNode on a
+    // frame owning element but does not immediately insert it into the new
+    // document before JavaScript yields to WebCore.  If the element is not yet
+    // in a document by the time this timer fires, the frame hierarchy teardown
+    // will continue.  This can also be seen as implementation of:
+    // "Removing an iframe from a Document does not cause its browsing context
+    // to be discarded. Indeed, an iframe's browsing context can survive its
+    // original parent Document if its iframe is moved to another Document."
+    // From HTML5: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-iframe-element.html#the-iframe-element
+    Timer<HTMLFrameElementBase> m_checkInDocumentTimer;
 
     bool m_viewSource;
-
-    bool m_shouldOpenURLAfterAttach;
-
     bool m_remainsAliveOnRemovalFromTree;
 };