diff --git a/layout/generic/nsPlaceholderFrame.cpp b/layout/generic/nsPlaceholderFrame.cpp
index 03e940a0a24..2d1bf1aa7d9 100644
--- a/layout/generic/nsPlaceholderFrame.cpp
+++ b/layout/generic/nsPlaceholderFrame.cpp
@@ -93,3 +93,23 @@ nsPlaceholderFrame::GetFrameName(nsString& aResult) const
 {
   return MakeFrameName("Placeholder", aResult);
 }
+
+NS_IMETHODIMP
+nsPlaceholderFrame::List(FILE* out, PRInt32 aIndent) const
+{
+  IndentBy(out, aIndent);
+  ListTag(out);
+  nsIView* view;
+  GetView(&view);
+  if (nsnull != view) {
+    fprintf(out, " [view=%p]", view);
+  }
+  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
+  if (0 != mState) {
+    fprintf(out, " [state=%08x]", mState);
+  }
+  fprintf(out, " outOfFlowFrame=");
+  nsFrame::ListTag(out, mOutOfFlowFrame);
+  fputs("\n", out);
+  return NS_OK;
+}
diff --git a/layout/generic/nsPlaceholderFrame.h b/layout/generic/nsPlaceholderFrame.h
index 07d45630c51..51dbc522786 100644
--- a/layout/generic/nsPlaceholderFrame.h
+++ b/layout/generic/nsPlaceholderFrame.h
@@ -32,8 +32,8 @@ public:
   friend nsresult NS_NewPlaceholderFrame(nsIFrame**  aInstancePtrResult);
 
   // Get/Set the associated out of flow frame
-  nsIFrame*   GetOutOfFlowFrame() const {return mOutOfFlowFrame;}
-  void        SetOutOfFlowFrame(nsIFrame* aFrame) {mOutOfFlowFrame = aFrame;}
+  nsIFrame*  GetOutOfFlowFrame() const {return mOutOfFlowFrame;}
+  void       SetOutOfFlowFrame(nsIFrame* aFrame) {mOutOfFlowFrame = aFrame;}
 
   // nsIHTMLReflow overrides
   NS_IMETHOD Reflow(nsIPresContext& aPresContext,
@@ -46,6 +46,7 @@ public:
                    nsIRenderingContext& aRenderingContext,
                    const nsRect& aDirtyRect,
                    nsFramePaintLayer aWhichLayer);
+  NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
 
   /**
    * Get the "type" of the frame
@@ -54,7 +55,7 @@ public:
    */
   NS_IMETHOD GetFrameType(nsIAtom** aType) const;
 
-  NS_IMETHOD  GetFrameName(nsString& aResult) const;
+  NS_IMETHOD GetFrameName(nsString& aResult) const;
 
 protected:
   nsIFrame* mOutOfFlowFrame;
diff --git a/layout/html/base/src/nsPlaceholderFrame.cpp b/layout/html/base/src/nsPlaceholderFrame.cpp
index 03e940a0a24..2d1bf1aa7d9 100644
--- a/layout/html/base/src/nsPlaceholderFrame.cpp
+++ b/layout/html/base/src/nsPlaceholderFrame.cpp
@@ -93,3 +93,23 @@ nsPlaceholderFrame::GetFrameName(nsString& aResult) const
 {
   return MakeFrameName("Placeholder", aResult);
 }
+
+NS_IMETHODIMP
+nsPlaceholderFrame::List(FILE* out, PRInt32 aIndent) const
+{
+  IndentBy(out, aIndent);
+  ListTag(out);
+  nsIView* view;
+  GetView(&view);
+  if (nsnull != view) {
+    fprintf(out, " [view=%p]", view);
+  }
+  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
+  if (0 != mState) {
+    fprintf(out, " [state=%08x]", mState);
+  }
+  fprintf(out, " outOfFlowFrame=");
+  nsFrame::ListTag(out, mOutOfFlowFrame);
+  fputs("\n", out);
+  return NS_OK;
+}
diff --git a/layout/html/base/src/nsPlaceholderFrame.h b/layout/html/base/src/nsPlaceholderFrame.h
index 07d45630c51..51dbc522786 100644
--- a/layout/html/base/src/nsPlaceholderFrame.h
+++ b/layout/html/base/src/nsPlaceholderFrame.h
@@ -32,8 +32,8 @@ public:
   friend nsresult NS_NewPlaceholderFrame(nsIFrame**  aInstancePtrResult);
 
   // Get/Set the associated out of flow frame
-  nsIFrame*   GetOutOfFlowFrame() const {return mOutOfFlowFrame;}
-  void        SetOutOfFlowFrame(nsIFrame* aFrame) {mOutOfFlowFrame = aFrame;}
+  nsIFrame*  GetOutOfFlowFrame() const {return mOutOfFlowFrame;}
+  void       SetOutOfFlowFrame(nsIFrame* aFrame) {mOutOfFlowFrame = aFrame;}
 
   // nsIHTMLReflow overrides
   NS_IMETHOD Reflow(nsIPresContext& aPresContext,
@@ -46,6 +46,7 @@ public:
                    nsIRenderingContext& aRenderingContext,
                    const nsRect& aDirtyRect,
                    nsFramePaintLayer aWhichLayer);
+  NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
 
   /**
    * Get the "type" of the frame
@@ -54,7 +55,7 @@ public:
    */
   NS_IMETHOD GetFrameType(nsIAtom** aType) const;
 
-  NS_IMETHOD  GetFrameName(nsString& aResult) const;
+  NS_IMETHOD GetFrameName(nsString& aResult) const;
 
 protected:
   nsIFrame* mOutOfFlowFrame;