diff --git a/web-animations/interfaces/AnimationEffectTiming/delay.html b/web-animations/interfaces/AnimationEffectTiming/delay.html
index bbf48ddb747e1f..a28f74ff64a51b 100644
--- a/web-animations/interfaces/AnimationEffectTiming/delay.html
+++ b/web-animations/interfaces/AnimationEffectTiming/delay.html
@@ -12,6 +12,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.delay, 0);
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] }, 100);
diff --git a/web-animations/interfaces/AnimationEffectTiming/direction.html b/web-animations/interfaces/AnimationEffectTiming/direction.html
index 7ce63ffcc07ee9..fa9b6b30641ac7 100644
--- a/web-animations/interfaces/AnimationEffectTiming/direction.html
+++ b/web-animations/interfaces/AnimationEffectTiming/direction.html
@@ -12,6 +12,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.direction, 'normal');
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] }, 2000);
diff --git a/web-animations/interfaces/AnimationEffectTiming/duration.html b/web-animations/interfaces/AnimationEffectTiming/duration.html
index 8e2a1a1b97242d..dbde1a434542e4 100644
--- a/web-animations/interfaces/AnimationEffectTiming/duration.html
+++ b/web-animations/interfaces/AnimationEffectTiming/duration.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.duration, 'auto');
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] }, 2000);
diff --git a/web-animations/interfaces/AnimationEffectTiming/easing.html b/web-animations/interfaces/AnimationEffectTiming/easing.html
index ac35b450cc2c6f..56116069e44126 100644
--- a/web-animations/interfaces/AnimationEffectTiming/easing.html
+++ b/web-animations/interfaces/AnimationEffectTiming/easing.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.easing, 'linear');
+}, 'Test default value');
+
 function assert_progress(animation, currentTime, easingFunction) {
   animation.currentTime = currentTime;
   var portion = currentTime / animation.effect.timing.duration;
diff --git a/web-animations/interfaces/AnimationEffectTiming/endDelay.html b/web-animations/interfaces/AnimationEffectTiming/endDelay.html
index 3f27daa03d23e2..47d2fbee6d424e 100644
--- a/web-animations/interfaces/AnimationEffectTiming/endDelay.html
+++ b/web-animations/interfaces/AnimationEffectTiming/endDelay.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.endDelay, 0);
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] }, 2000);
diff --git a/web-animations/interfaces/AnimationEffectTiming/fill.html b/web-animations/interfaces/AnimationEffectTiming/fill.html
index 32b3178b71f214..bb7973f48f0311 100644
--- a/web-animations/interfaces/AnimationEffectTiming/fill.html
+++ b/web-animations/interfaces/AnimationEffectTiming/fill.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.fill, 'auto');
+}, 'Test default value');
+
 ["none", "forwards", "backwards", "both", ].forEach(function(fill){
   test(function(t) {
     var div = createDiv(t);
diff --git a/web-animations/interfaces/AnimationEffectTiming/iterationStart.html b/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
index 7732411c6a18f1..df3f992d4c2cde 100644
--- a/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
+++ b/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.iterationStart, 0);
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] },
diff --git a/web-animations/interfaces/AnimationEffectTiming/iterations.html b/web-animations/interfaces/AnimationEffectTiming/iterations.html
index 7593306e6788fd..6e7bacb764fd0f 100644
--- a/web-animations/interfaces/AnimationEffectTiming/iterations.html
+++ b/web-animations/interfaces/AnimationEffectTiming/iterations.html
@@ -11,6 +11,11 @@
 <script>
 'use strict';
 
+test(function(t) {
+  var anim = createDiv(t).animate(null);
+  assert_equals(anim.effect.timing.iterations, 1);
+}, 'Test default value');
+
 test(function(t) {
   var div = createDiv(t);
   var anim = div.animate({ opacity: [ 0, 1 ] }, 2000);