--- a/layout/base/nsFrameManager.cpp
+++ b/layout/base/nsFrameManager.cpp
@@ -213,17 +213,18 @@ ParentForUndisplayedMap(const nsIContent
 
   nsIContent* parent = aContent->GetParentElementCrossingShadowRoot();
   MOZ_ASSERT(parent || !aContent->GetParent(), "no non-elements");
 
   return parent;
 }
 
 /* static */ nsStyleContext*
-nsFrameManager::GetStyleContextInMap(UndisplayedMap* aMap, nsIContent* aContent)
+nsFrameManager::GetStyleContextInMap(UndisplayedMap* aMap,
+                                     const nsIContent* aContent)
 {
   UndisplayedNode* node = GetUndisplayedNodeInMapFor(aMap, aContent);
   return node ? node->mStyle.get() : nullptr;
 }
 
 /* static */ UndisplayedNode*
 nsFrameManager::GetUndisplayedNodeInMapFor(UndisplayedMap* aMap,
                                            const nsIContent* aContent)

--- a/layout/base/nsFrameManager.h
+++ b/layout/base/nsFrameManager.h
@@ -97,17 +97,17 @@ public:
   // Placeholder frame functions
   nsPlaceholderFrame* GetPlaceholderFrameFor(const nsIFrame* aFrame);
   void RegisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
   void UnregisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
 
   void      ClearPlaceholderFrameMap();
 
   // Mapping undisplayed content
-  nsStyleContext* GetUndisplayedContent(nsIContent* aContent)
+  nsStyleContext* GetUndisplayedContent(const nsIContent* aContent)
   {
     if (!mUndisplayedMap) {
       return nullptr;
     }
     return GetStyleContextInMap(mUndisplayedMap, aContent);
   }
   mozilla::UndisplayedNode*
     GetAllUndisplayedContentIn(nsIContent* aParentContent);
@@ -122,17 +122,17 @@ public:
   void ClearUndisplayedContentIn(nsIContent* aContent,
                                  nsIContent* aParentContent);
   void ClearAllUndisplayedContentIn(nsIContent* aParentContent);
 
   // display:contents related methods:
   /**
    * Return the registered display:contents style context for aContent, if any.
    */
-  nsStyleContext* GetDisplayContentsStyleFor(nsIContent* aContent)
+  nsStyleContext* GetDisplayContentsStyleFor(const nsIContent* aContent)
   {
     if (!mDisplayContentsMap) {
       return nullptr;
     }
     return GetStyleContextInMap(mDisplayContentsMap, aContent);
   }
 
   /**
@@ -215,17 +215,17 @@ public:
    */
   void CaptureFrameStateFor(nsIFrame*              aFrame,
                                         nsILayoutHistoryState* aState);
 
   void RestoreFrameStateFor(nsIFrame*              aFrame,
                                         nsILayoutHistoryState* aState);
 protected:
   static nsStyleContext* GetStyleContextInMap(UndisplayedMap* aMap,
-                                              nsIContent* aContent);
+                                              const nsIContent* aContent);
   static mozilla::UndisplayedNode*
     GetUndisplayedNodeInMapFor(UndisplayedMap* aMap,
                                const nsIContent* aContent);
   static mozilla::UndisplayedNode*
     GetAllUndisplayedNodesInMapFor(UndisplayedMap* aMap,
                                    nsIContent* aParentContent);
   static void SetStyleContextInMap(UndisplayedMap* aMap,
                                    nsIContent* aContent,

--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -4,16 +4,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/ServoBindings.h"
 
 #include "ChildIterator.h"
 #include "gfxFontFamilyList.h"
 #include "nsAttrValueInlines.h"
+#include "nsCSSFrameConstructor.h"
 #include "nsCSSProps.h"
 #include "nsCSSParser.h"
 #include "nsCSSPseudoElements.h"
 #include "nsCSSRuleProcessor.h"
 #include "nsContentUtils.h"
 #include "nsDOMTokenList.h"
 #include "nsIContentInlines.h"
 #include "nsIDOMNode.h"
@@ -274,21 +275,27 @@ Gecko_SetOwnerDocumentNeedsStyleFlush(Ra
 
 nsStyleContext*
 Gecko_GetStyleContext(RawGeckoNodeBorrowed aNode, nsIAtom* aPseudoTagOrNull)
 {
   MOZ_ASSERT(aNode->IsContent());
   nsIFrame* relevantFrame =
     ServoRestyleManager::FrameForPseudoElement(aNode->AsContent(),
                                                aPseudoTagOrNull);
-  if (!relevantFrame) {
-    return nullptr;
+  if (relevantFrame) {
+    return relevantFrame->StyleContext();
   }
 
-  return relevantFrame->StyleContext();
+  // FIXME(emilio): Is there a shorter path?
+  nsCSSFrameConstructor* fc =
+    aNode->OwnerDoc()->GetShell()->GetPresContext()->FrameConstructor();
+
+  // NB: This is only called for CalcStyleDifference, and we handle correctly
+  // the display: none case since Servo still has the older style.
+  return fc->GetDisplayContentsStyleFor(aNode->AsContent());
 }
 
 nsChangeHint
 Gecko_CalcStyleDifference(nsStyleContext* aOldStyleContext,
                           ServoComputedValuesBorrowed aComputedValues)
 {
   MOZ_ASSERT(aOldStyleContext);
   MOZ_ASSERT(aComputedValues);