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diff --git a/dom/animation/test/css-animations/file_pseudoElement-get-animations.html b/dom/animation/test/css-animations/file_pseudoElement-get-animations.html
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+<!doctype html>
+<meta charset=utf-8>
+<script src="../testcommon.js"></script>
+<style>
+@keyframes anim1 { }
+@keyframes anim2 { }
+.before::before {
+  animation: anim1 10s;
+}
+.after-with-mix-anims-trans::after {
+  content: '';
+  animation: anim1 10s, anim2 10s;
+  width: 0px;
+  height: 0px;
+  transition: all 100s;
+}
+.after-change::after {
+  width: 100px;
+  height: 100px;
+}
+</style>
+<body>
+<script>
+'use strict';
+
+test(function(t) {
+  var div = addDiv(t, { class: 'before' });
+  var pseudoTarget = document.getAnimations()[0].effect.target;
+  assert_equals(pseudoTarget.getAnimations().length, 1,
+                'Expected number of animations are returned');
+  assert_equals(pseudoTarget.getAnimations()[0].animationName, 'anim1',
+                'CSS animation name matches');
+}, 'getAnimations returns CSSAnimation objects');
+
+test(function(t) {
+  var div = addDiv(t, { class: 'after-with-mix-anims-trans' });
+  // Trigger transitions
+  flushComputedStyle(div);
+  div.classList.add('after-change');
+
+  // Create additional animation on the pseudo-element from script
+  var pseudoTarget = document.getAnimations()[0].effect.target;
+  var effect = new KeyframeEffectReadOnly(pseudoTarget,
+                                          { background: ["blue", "red"] },
+                                          3 * MS_PER_SEC);
+  var newAnimation = new Animation(effect, document.timeline);
+  newAnimation.id = 'scripted-anim';
+  newAnimation.play();
+
+  // Check order - the script-generated animation should appear later
+  var anims = pseudoTarget.getAnimations();
+  assert_equals(anims.length, 5,
+                'Got expected number of animations/trnasitions running on ' +
+                '::after pseudo element');
+  assert_equals(anims[0].transitionProperty, 'height',
+                '1st animation is the 1st transition sorted by name');
+  assert_equals(anims[1].transitionProperty, 'width',
+                '2nd animation is the 2nd transition sorted by name ');
+  assert_equals(anims[2].animationName, 'anim1',
+                '3rd animation is the 1st animation in animation-name list');
+  assert_equals(anims[3].animationName, 'anim2',
+                '4rd animation is the 2nd animation in animation-name list');
+  assert_equals(anims[4].id, 'scripted-anim',
+                'Animation added by script appears last');
+}, 'getAnimations returns css transitions/animations, and script-generated ' +
+   'animations in the expected order');
+
+done();
+</script>
+</body>