diff --git a/layout/reftests/bugs/485275-1-ref.html b/layout/reftests/bugs/485275-1-ref.html
new file mode 100644
index 00000000000..b31ac81b5c5
--- /dev/null
+++ b/layout/reftests/bugs/485275-1-ref.html
@@ -0,0 +1,7 @@
+
+
+
+
+
diff --git a/layout/reftests/bugs/485275-1.html b/layout/reftests/bugs/485275-1.html
new file mode 100644
index 00000000000..f68c0172c56
--- /dev/null
+++ b/layout/reftests/bugs/485275-1.html
@@ -0,0 +1,7 @@
+
+
+
+
+
diff --git a/layout/reftests/bugs/485275-1.svg b/layout/reftests/bugs/485275-1.svg
new file mode 100644
index 00000000000..9f3f5eb1c66
--- /dev/null
+++ b/layout/reftests/bugs/485275-1.svg
@@ -0,0 +1,7 @@
+
\ No newline at end of file
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 33e00415d37..3f646645f4f 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1121,6 +1121,8 @@ fails == 461512-1.html 461512-1-ref.html # Bug 461512
== 482659-1b.html 482659-1-ref.html
== 482659-1c.html 482659-1-ref.html
== 482659-1d.html 482659-1-ref.html
+== 485275-1.html 485275-1-ref.html
+== 485275-1.svg 485275-1-ref.html
== 486052-1.html 486052-1-ref.html
== 486052-2a.html 486052-2-ref.html
== 486052-2b.html 486052-2-ref.html
diff --git a/view/src/nsViewManager.cpp b/view/src/nsViewManager.cpp
index 75d1d3a4f70..61bf2e3181f 100644
--- a/view/src/nsViewManager.cpp
+++ b/view/src/nsViewManager.cpp
@@ -592,9 +592,15 @@ void nsViewManager::AddCoveringWidgetsToOpaqueRegion(nsRegion &aRgn, nsIDeviceCo
void nsViewManager::RenderViews(nsView *aView, nsIRenderingContext& aRC,
const nsRegion& aRegion)
{
+ nsView* displayRoot = GetDisplayRootFor(aView);
+ // Make sure we call Paint from the view manager that owns displayRoot.
+ // (Bug 485275)
+ nsViewManager* displayRootVM = displayRoot->GetViewManager();
+ if (displayRootVM && displayRootVM != this)
+ return displayRootVM->RenderViews(aView, aRC, aRegion);
+
if (mObserver) {
- nsView* displayRoot = GetDisplayRootFor(aView);
- nsPoint offsetToRoot = aView->GetOffsetTo(displayRoot);
+ nsPoint offsetToRoot = aView->GetOffsetTo(displayRoot);
nsRegion damageRegion(aRegion);
damageRegion.MoveBy(offsetToRoot);