diff --git a/dom/base/Element.cpp b/dom/base/Element.cpp
index cae3a49eb6fc..baae4326c429 100644
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -3318,6 +3318,13 @@ Element::GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations)
     doc->FlushPendingNotifications(Flush_Style);
   }
 
+  GetAnimationsUnsorted(aAnimations);
+  aAnimations.Sort(AnimationPtrComparator<RefPtr<Animation>>());
+}
+
+void
+Element::GetAnimationsUnsorted(nsTArray<RefPtr<Animation>>& aAnimations)
+{
   EffectSet* effects = EffectSet::GetEffectSet(this,
                          nsCSSPseudoElements::ePseudo_NotPseudoElement);
   if (!effects) {
@@ -3335,8 +3342,6 @@ Element::GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations)
                "effect set");
     aAnimations.AppendElement(animation);
   }
-
-  aAnimations.Sort(AnimationPtrComparator<RefPtr<Animation>>());
 }
 
 NS_IMETHODIMP
diff --git a/dom/base/Element.h b/dom/base/Element.h
index a527486664ab..ef06d258bd49 100644
--- a/dom/base/Element.h
+++ b/dom/base/Element.h
@@ -821,7 +821,9 @@ public:
   {
   }
 
+  // Note: GetAnimations will flush style while GetAnimationsUnsorted won't.
   void GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations);
+  void GetAnimationsUnsorted(nsTArray<RefPtr<Animation>>& aAnimations);
 
   NS_IMETHOD GetInnerHTML(nsAString& aInnerHTML);
   virtual void SetInnerHTML(const nsAString& aInnerHTML, ErrorResult& aError);
diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index cc2a4b07b490..7b71a86477ea 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -10,10 +10,12 @@
 
 #include "nsDocument.h"
 
+#include "mozilla/AnimationComparator.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/BinarySearch.h"
 #include "mozilla/DebugOnly.h"
+#include "mozilla/EffectSet.h"
 #include "mozilla/IntegerRange.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/Likely.h"
@@ -3134,6 +3136,32 @@ nsDocument::Timeline()
   return mDocumentTimeline;
 }
 
+void
+nsDocument::GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations)
+{
+  FlushPendingNotifications(Flush_Style);
+
+  // Bug 1174575: Until we implement a suitable PseudoElement interface we
+  // don't have anything to return for the |target| attribute of
+  // KeyframeEffect(ReadOnly) objects that refer to pseudo-elements.
+  // Rather than return some half-baked version of these objects (e.g.
+  // we a null effect attribute) we simply don't provide access to animations
+  // whose effect refers to a pseudo-element until we can support them
+  // properly.
+  for (nsIContent* node = nsINode::GetFirstChild();
+       node;
+       node = node->GetNextNode(this)) {
+    if (!node->IsElement()) {
+      continue;
+    }
+
+    node->AsElement()->GetAnimationsUnsorted(aAnimations);
+  }
+
+  // Sort animations by priority
+  aAnimations.Sort(AnimationPtrComparator<RefPtr<Animation>>());
+}
+
 /* Return true if the document is in the focused top-level window, and is an
  * ancestor of the focused DOMWindow. */
 NS_IMETHODIMP
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index aa3499604bdd..7e75d573ff82 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -787,6 +787,8 @@ public:
 
   static bool IsWebAnimationsEnabled(JSContext* aCx, JSObject* aObject);
   virtual mozilla::dom::DocumentTimeline* Timeline() override;
+  virtual void GetAnimations(
+      nsTArray<RefPtr<mozilla::dom::Animation>>& aAnimations) override;
 
   virtual nsresult SetSubDocumentFor(Element* aContent,
                                      nsIDocument* aSubDoc) override;
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index 184504a95f0d..266f4a4ccb89 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -103,6 +103,7 @@ class Rule;
 } // namespace css
 
 namespace dom {
+class Animation;
 class AnonymousContent;
 class Attr;
 class BoxObject;
@@ -2156,6 +2157,9 @@ public:
 
   virtual mozilla::dom::DocumentTimeline* Timeline() = 0;
 
+  virtual void GetAnimations(
+      nsTArray<RefPtr<mozilla::dom::Animation>>& aAnimations) = 0;
+
   nsresult ScheduleFrameRequestCallback(mozilla::dom::FrameRequestCallback& aCallback,
                                         int32_t *aHandle);
   void CancelFrameRequestCallback(int32_t aHandle);
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index a103795fcec9..6241d9fc3933 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -303,6 +303,8 @@ partial interface Document {
 partial interface Document {
   [Func="nsDocument::IsWebAnimationsEnabled"]
   readonly attribute DocumentTimeline timeline;
+  [Func="nsDocument::IsWebAnimationsEnabled"]
+  sequence<Animation> getAnimations();
 };
 
 //  Mozilla extensions of various sorts