diff --git a/gfx/layers/composite/AsyncCompositionManager.cpp b/gfx/layers/composite/AsyncCompositionManager.cpp
index f1c2ebed0f4a..8f8b8f6ad6ae 100644
--- a/gfx/layers/composite/AsyncCompositionManager.cpp
+++ b/gfx/layers/composite/AsyncCompositionManager.cpp
@@ -441,7 +441,8 @@ SampleAnimations(Layer* aLayer, TimeStamp aPoint)
 
     MOZ_ASSERT(!animation.startTime().IsNull(),
                "Failed to resolve start time of pending animations");
-    TimeDuration elapsedDuration = aPoint - animation.startTime();
+    TimeDuration elapsedDuration =
+      (aPoint - animation.startTime()).MultDouble(animation.playbackRate());
     // Skip animations that are yet to start.
     //
     // Currently, this should only happen when the refresh driver is under test
diff --git a/gfx/layers/ipc/LayersMessages.ipdlh b/gfx/layers/ipc/LayersMessages.ipdlh
index 857b155c43e2..6559570452a7 100644
--- a/gfx/layers/ipc/LayersMessages.ipdlh
+++ b/gfx/layers/ipc/LayersMessages.ipdlh
@@ -198,6 +198,7 @@ struct Animation {
   int32_t direction;
   nsCSSProperty property;
   AnimationData data;
+  float playbackRate;
 };
 
 // Change a layer's attributes
diff --git a/layout/base/nsDisplayList.cpp b/layout/base/nsDisplayList.cpp
index 9c17dd61808f..66eca9a1ae74 100644
--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -385,6 +385,7 @@ AddAnimationForProperty(nsIFrame* aFrame, const AnimationProperty& aProperty,
   animation->iterationCount() = timing.mIterationCount;
   animation->direction() = timing.mDirection;
   animation->property() = aProperty.mProperty;
+  animation->playbackRate() = aAnimation->PlaybackRate();
   animation->data() = aData;
 
   for (uint32_t segIdx = 0; segIdx < aProperty.mSegments.Length(); segIdx++) {
diff --git a/layout/style/test/file_animations_playbackrate.html b/layout/style/test/file_animations_playbackrate.html
new file mode 100644
index 000000000000..c921b254d98b
--- /dev/null
+++ b/layout/style/test/file_animations_playbackrate.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <script type="application/javascript"
+    src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript" src="animation_utils.js"></script>
+  <style type="text/css">
+    @keyframes anim {
+      0% { transform: translate(0px) }
+      100% { transform: translate(100px) }
+    }
+    .target {
+      /* The animation target needs geometry in order to qualify for OMTA */
+      width: 100px;
+      height: 100px;
+      background-color: white;
+    }
+  </style>
+  <script>
+    var ok = opener.ok.bind(opener);
+    var is = opener.is.bind(opener);
+    var todo = opener.todo.bind(opener);
+    function finish() {
+      var o = opener;
+      self.close();
+      o.SimpleTest.finish();
+    }
+  </script>
+</head>
+<body>
+<div id="display"></div>
+<script type="application/javascript">
+"use strict";
+
+runOMTATest(function() {
+  runAllAsyncAnimTests().then(function() {
+    finish();
+  });
+}, finish, opener.SpecialPowers);
+
+addAsyncAnimTest(function *() {
+  var [ div, cs ] = new_div("animation: anim 10s 1 linear forwards");
+  var animation = div.getAnimations()[0];
+  animation.playbackRate = 10;
+
+  advance_clock(300);
+
+  yield waitForPaints();
+  omta_is(div, "transform", { tx: 30 }, RunningOn.Compositor,
+          "at 300ms");
+  done_div();
+});
+</script>
+</body>
+</html>
diff --git a/layout/style/test/mochitest.ini b/layout/style/test/mochitest.ini
index 0763b8336c4f..c2d80b363c86 100644
--- a/layout/style/test/mochitest.ini
+++ b/layout/style/test/mochitest.ini
@@ -42,6 +42,8 @@ skip-if = toolkit == 'android'
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') # bug 1041017
 [test_animations_pausing.html]
 support-files = file_animations_pausing.html
+[test_animations_playbackrate.html]
+support-files = file_animations_playbackrate.html
 [test_any_dynamic.html]
 [test_at_rule_parse_serialize.html]
 [test_bug73586.html]
diff --git a/layout/style/test/test_animations_playbackrate.html b/layout/style/test/test_animations_playbackrate.html
new file mode 100644
index 000000000000..16deca02c1f6
--- /dev/null
+++ b/layout/style/test/test_animations_playbackrate.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1175751
+-->
+<head>
+  <title>Test for Animation.playbackRate on compositor animations (Bug 1175751)</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1175751">Mozilla Bug 1175751</a>
+<div id="display"></div>
+<pre id="test">
+<script type="application/javascript">
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+SpecialPowers.pushPrefEnv(
+  { "set": [[ "dom.animations-api.core.enabled", true]] },
+  function() {
+    window.open("file_animations_playbackrate.html");
+  });
+</script>
+</pre>
+</body>
+</html>
