diff --git a/mozilla/layout/base/nsCSSFrameConstructor.cpp b/mozilla/layout/base/nsCSSFrameConstructor.cpp
index 6f403770cfd..3a8e1f1b5d8 100644
--- a/mozilla/layout/base/nsCSSFrameConstructor.cpp
+++ b/mozilla/layout/base/nsCSSFrameConstructor.cpp
@@ -7652,15 +7652,19 @@ nsCSSFrameConstructor::ConstructSVGFrame(nsFrameConstructorState& aState,
                   ;
   }
 
-  if (aTag != nsSVGAtoms::svg && !parentIsSVG) {
+  if ((aTag != nsSVGAtoms::svg && !parentIsSVG) ||
+      (aTag == nsGkAtoms::desc || aTag == nsGkAtoms::title)) {
     // Sections 5.1 and G.4 of SVG 1.1 say that SVG elements other than
     // svg:svg not contained within svg:svg are incorrect, although they
     // don't seem to specify error handling.  Ignore them, since many of
     // our frame classes can't deal.  It *may* be that the document
     // should at that point be considered in error according to F.2, but
     // it's hard to tell.
+    //
     // Style mutation can't change this situation, so don't bother
     // adding to the undisplayed content map.
+    //
+    // We don't currently handle any UI for desc/title
     *aHaltProcessing = PR_TRUE;
     return NS_OK;
   }
diff --git a/mozilla/layout/svg/base/src/nsSVGContainerFrame.cpp b/mozilla/layout/svg/base/src/nsSVGContainerFrame.cpp
index f4fc3df6789..74bd6443be6 100644
--- a/mozilla/layout/svg/base/src/nsSVGContainerFrame.cpp
+++ b/mozilla/layout/svg/base/src/nsSVGContainerFrame.cpp
@@ -154,7 +154,7 @@ nsSVGDisplayContainerFrame::RemoveFrame(nsIAtom* aListName,
   nsISVGChildFrame* SVGFrame = nsnull;
   CallQueryInterface(aOldFrame, &SVGFrame);
 
-  if (SVGFrame)
+  if (SVGFrame && !(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD))
     dirtyRect = SVGFrame->GetCoveredRegion();
 
   PRBool result = nsSVGContainerFrame::RemoveFrame(aListName, aOldFrame);