--- a/layout/svg/nsSVGIntegrationUtils.cpp
+++ b/layout/svg/nsSVGIntegrationUtils.cpp
@@ -562,17 +562,27 @@ nsSVGIntegrationUtils::PaintFramesWithEf
       gfxRect clipRect = aContext.GetClipExtents();
       {
         gfxContextMatrixAutoSaveRestore matRestore(&aContext);
 
         aContext.SetMatrix(gfxMatrix());
         clipRect = aContext.GetClipExtents();
       }
       IntRect drawRect = RoundedOut(ToRect(clipRect));
-      RefPtr<DrawTarget> targetDT = aContext.GetDrawTarget()->CreateSimilarDrawTarget(drawRect.Size(), SurfaceFormat::A8);
+
+      // Mask composition result on CoreGraphic::A8 surface is not correct
+      // when mask-mode is not add(source over). Switch to skia when CG backend
+      // detected.
+      RefPtr<DrawTarget> targetDT =
+        (aContext.GetDrawTarget()->GetBackendType() == BackendType::COREGRAPHICS) ?
+          Factory::CreateDrawTarget(BackendType::SKIA, drawRect.Size(),
+                                    SurfaceFormat::A8) :
+          aContext.GetDrawTarget()->CreateSimilarDrawTarget(drawRect.Size(),
+                                                            SurfaceFormat::A8);
+
       if (!targetDT || !targetDT->IsValid()) {
         aContext.Restore();
         return;
       }
 
       RefPtr<gfxContext> target = gfxContext::ForDrawTarget(targetDT);
       MOZ_ASSERT(target); // alrady checked the draw target above
       target->SetMatrix(matrixAutoSaveRestore.Matrix() * gfxMatrix::Translation(-drawRect.TopLeft()));