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diff --git a/dom/animation/test/chrome/test_keyframe_effect_xrays.html b/dom/animation/test/chrome/test_keyframe_effect_xrays.html
new file mode 100644
index 0000000000..ca3e712ac5
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+++ b/dom/animation/test/chrome/test_keyframe_effect_xrays.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<head>
+<meta charset=utf-8>
+<script type="application/javascript" src="../testharness.js"></script>
+<script type="application/javascript" src="../testharnessreport.js"></script>
+<script type="application/javascript" src="../testcommon.js"></script>
+</head>
+<body>
+<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1414674"
+  target="_blank">Mozilla Bug 1414674</a>
+<div id="log"></div>
+<iframe id="iframe"
+  src="http://example.org/tests/dom/animation/test/chrome/file_animate_xrays.html"></iframe>
+<script>
+'use strict';
+
+var win = document.getElementById('iframe').contentWindow;
+
+async_test(function(t) {
+  window.addEventListener('load', t.step_func(function() {
+    var target = win.document.getElementById('target');
+    var effect = new win.KeyframeEffect(target, [
+      {opacity: 1, offset: 0},
+      {opacity: 0, offset: 1},
+    ], {duration: 100 * MS_PER_SEC, fill: "forwards"});
+    // The frames object should be accessible via x-ray.
+    var frames = effect.getKeyframes();
+    assert_equals(frames.length, 2,
+                  "frames for KeyframeEffect ctor should be non-zero");
+    assert_equals(frames[0].opacity, "1",
+                  "first frame opacity for KeyframeEffect ctor should be specified value");
+    assert_equals(frames[0].computedOffset, 0,
+                  "first frame offset for KeyframeEffect ctor should be 0");
+    assert_equals(frames[1].opacity, "0",
+                  "last frame opacity for KeyframeEffect ctor should be specified value");
+    assert_equals(frames[1].computedOffset, 1,
+                  "last frame offset for KeyframeEffect ctor should be 1");
+    var animation = new win.Animation(effect, document.timeline);
+    animation.play();
+    t.done();
+  }));
+}, 'Calling KeyframeEffect() ctor across x-rays');
+
+</script>
+</body>