--- a/dom/animation/test/mozilla/file_deferred_start.html
+++ b/dom/animation/test/mozilla/file_deferred_start.html
@@ -99,18 +99,25 @@ promise_test(function(t) {
   // occasionally produce a false negative on one platform, another platform
   // will fail as expected.
   return waitForDocLoad().then(() => waitForIdle())
   .then(() => waitForPaints())
   .then(() => {
     div.animate({ transform: [ 'translate(0px)', 'translate(100px)' ] },
                 { duration: 400 * MS_PER_SEC,
                   delay: -200 * MS_PER_SEC });
-    return waitForPaints();
-  }).then(() => {
+
+    // TODO: Current waitForPaint() will not wait for MozAfterPaint in this
+    // case(Bug 1341294), so this waiting code is workaround for it.
+    // This waitForFrame() uses Promise, but bug 1193394 will be using same
+    // handling of  microtask, so if landed bug 1193394 this test might be
+    // failure since this promise will resolve in same tick of Element.animate.
+    return waitForFrame();
+  }).then(() => waitForPaints())
+  .then(() => {
     const transformStr =
       SpecialPowers.DOMWindowUtils.getOMTAStyle(div, 'transform');
     const translateX = getTranslateXFromTransform(transformStr);
 
     // If the delay has been applied we should be about half-way through
     // the animation. However, if we applied it twice we will be at the
     // end of the animation already so check that we are roughly half way
     // through.
@@ -141,18 +148,22 @@ promise_test(function(t) {
   return waitForDocLoad().then(() => waitForIdle())
   .then(() => waitForPaints())
   .then(() => {
     const animation =
       div.animate({ transform: [ 'translate(0px)', 'translate(100px)' ] },
                   200 * MS_PER_SEC);
     animation.currentTime = 100 * MS_PER_SEC;
     animation.playbackRate = 0.1;
-    return waitForPaints();
-  }).then(() => {
+
+    // As the above test case, we should fix bug 1341294 before bug 1193394
+    // lands.
+    return waitForFrame();
+  }).then(() => waitForPaints())
+  .then(() => {
     const transformStr =
       SpecialPowers.DOMWindowUtils.getOMTAStyle(div, 'transform');
     const translateX = getTranslateXFromTransform(transformStr);
 
     // We pass the playback rate to the compositor independently and we have
     // tests to ensure that it is correctly applied there. However, if, when
     // we resolve the start time of the pending animation, we fail to
     // incorporate the playback rate, we will end up starting from the wrong