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diff --git a/dom/animation/test/css-transitions/file_animation-cancel.html b/dom/animation/test/css-transitions/file_animation-cancel.html
new file mode 100644
index 000000000..6094b383f
--- /dev/null
+++ b/dom/animation/test/css-transitions/file_animation-cancel.html
@@ -0,0 +1,165 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="../testcommon.js"></script>
+<body>
+<script>
+'use strict';
+
+promise_test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  var animation = div.getAnimations()[0];
+  return animation.ready.then(waitForFrame).then(function() {
+    assert_not_equals(getComputedStyle(div).marginLeft, '1000px',
+                      'transform style is animated before cancelling');
+    animation.cancel();
+    assert_equals(getComputedStyle(div).marginLeft, div.style.marginLeft,
+                  'transform style is no longer animated after cancelling');
+  });
+}, 'Animated style is cleared after cancelling a running CSS transition');
+
+promise_test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  div.addEventListener('transitionend', function() {
+    assert_unreached('Got unexpected end event on cancelled transition');
+  });
+
+  var animation = div.getAnimations()[0];
+  return animation.ready.then(function() {
+    // Seek to just before the end then cancel
+    animation.currentTime = 99.9 * 1000;
+    animation.cancel();
+
+    // Then wait a couple of frames and check that no event was dispatched
+    return waitForAnimationFrames(2);
+  });
+}, 'Cancelled CSS transitions do not dispatch events');
+
+promise_test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  var animation = div.getAnimations()[0];
+  return animation.ready.then(function() {
+    animation.cancel();
+    assert_equals(getComputedStyle(div).marginLeft, '1000px',
+                  'margin-left style is not animated after cancelling');
+    animation.play();
+    assert_equals(getComputedStyle(div).marginLeft, '0px',
+                  'margin-left style is animated after re-starting transition');
+    return animation.ready;
+  }).then(function() {
+    assert_equals(animation.playState, 'running',
+                  'Transition succeeds in running after being re-started');
+  });
+}, 'After cancelling a transition, it can still be re-used');
+
+promise_test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  var animation = div.getAnimations()[0];
+  return animation.ready.then(function() {
+    animation.finish();
+    animation.cancel();
+    assert_equals(getComputedStyle(div).marginLeft, '1000px',
+                  'margin-left style is not animated after cancelling');
+    animation.play();
+    assert_equals(getComputedStyle(div).marginLeft, '0px',
+                  'margin-left style is animated after re-starting transition');
+    return animation.ready;
+  }).then(function() {
+    assert_equals(animation.playState, 'running',
+                  'Transition succeeds in running after being re-started');
+  });
+}, 'After cancelling a finished transition, it can still be re-used');
+
+test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  var animation = div.getAnimations()[0];
+  animation.cancel();
+  assert_equals(getComputedStyle(div).marginLeft, '1000px',
+                'margin-left style is not animated after cancelling');
+
+  // Trigger a change to a transition property and check that this
+  // doesn't cause the animation to become live again
+  div.style.transitionDuration = '200s';
+  flushComputedStyle(div);
+  assert_equals(getComputedStyle(div).marginLeft, '1000px',
+                'margin-left style is still not animated after updating'
+                + ' transition-duration');
+  assert_equals(animation.playState, 'idle',
+                'Transition is still idle after updating transition-duration');
+}, 'After cancelling a transition, updating transition properties doesn\'t make'
+   + ' it live again');
+
+promise_test(function(t) {
+  var div = addDiv(t, { style: 'margin-left: 0px' });
+  flushComputedStyle(div);
+
+  div.style.transition = 'margin-left 100s';
+  div.style.marginLeft = '1000px';
+  flushComputedStyle(div);
+
+  var animation = div.getAnimations()[0];
+  return animation.ready.then(function() {
+    assert_equals(animation.playState, 'running');
+    div.style.display = 'none';
+    return waitForFrame();
+  }).then(function() {
+    assert_equals(animation.playState, 'idle');
+    assert_equals(getComputedStyle(div).marginLeft, '1000px');
+  });
+}, 'Setting display:none on an element cancels its transitions');
+
+promise_test(function(t) {
+  var parentDiv = addDiv(t);
+  var childDiv = document.createElement('div');
+  parentDiv.appendChild(childDiv);
+  childDiv.setAttribute('style', 'margin-left: 0px');
+
+  flushComputedStyle(childDiv);
+
+  childDiv.style.transition = 'margin-left 100s';
+  childDiv.style.marginLeft = '1000px';
+  flushComputedStyle(childDiv);
+
+  var animation = childDiv.getAnimations()[0];
+  return animation.ready.then(function() {
+    assert_equals(animation.playState, 'running');
+    parentDiv.style.display = 'none';
+    return waitForFrame();
+  }).then(function() {
+    assert_equals(animation.playState, 'idle');
+    assert_equals(getComputedStyle(childDiv).marginLeft, '1000px');
+  });
+}, 'Setting display:none cancels transitions on a child element');
+
+done();
+</script>
+</body>