diff --git a/csharp/tests/Facebook.CSSLayout/CSSLayoutAbsolutePositionTest.cs b/csharp/tests/Facebook.CSSLayout/CSSLayoutAbsolutePositionTest.cs
index c9ae2bb6..b5ee81a3 100644
--- a/csharp/tests/Facebook.CSSLayout/CSSLayoutAbsolutePositionTest.cs
+++ b/csharp/tests/Facebook.CSSLayout/CSSLayoutAbsolutePositionTest.cs
@@ -27,7 +27,7 @@
 </div>
 
 <div id="do_not_clamp_height_of_absolute_node_to_height_of_its_overflow_hidden_parent" style="height: 50px; width: 50px; overflow: hidden; flex-direction: row;">
-  <div style="position: absolute; start: 0; top: 0;">
+  <div style="position: absolute; start: 0px; top: 0px;">
     <div style="width: 100px; height: 100px;"></div>
   </div>
 </div>
@@ -219,6 +219,8 @@ namespace Facebook.CSSLayout
 
             CSSNode root_child0 = new CSSNode();
             root_child0.PositionType = CSSPositionType.Absolute;
+            root_child0.SetPosition(CSSEdge.Start, 0);
+            root_child0.SetPosition(CSSEdge.Top, 0);
             root.Insert(0, root_child0);
 
             CSSNode root_child0_child0 = new CSSNode();
diff --git a/gentest/fixtures/CSSLayoutAbsolutePositionTest.html b/gentest/fixtures/CSSLayoutAbsolutePositionTest.html
index bb6e5673..37ebffe8 100644
--- a/gentest/fixtures/CSSLayoutAbsolutePositionTest.html
+++ b/gentest/fixtures/CSSLayoutAbsolutePositionTest.html
@@ -15,7 +15,7 @@
 </div>
 
 <div id="do_not_clamp_height_of_absolute_node_to_height_of_its_overflow_hidden_parent" style="height: 50px; width: 50px; overflow: hidden; flex-direction: row;">
-  <div style="position: absolute; start: 0; top: 0;">
+  <div style="position: absolute; start: 0px; top: 0px;">
     <div style="width: 100px; height: 100px;"></div>
   </div>
 </div>
diff --git a/gentest/gentest.js b/gentest/gentest.js
index a680a9d0..07fef381 100755
--- a/gentest/gentest.js
+++ b/gentest/gentest.js
@@ -159,10 +159,10 @@ function checkDefaultValues() {
     {style:'overflow', value:'visible'},
     {style:'flex-grow', value:'0'},
     {style:'flex-shrink', value:'0'},
-    {style:'left', value:'0px'},
-    {style:'top', value:'0px'},
-    {style:'right', value:'0px'},
-    {style:'bottom', value:'0px'},
+    {style:'left', value:'undefined'},
+    {style:'top', value:'undefined'},
+    {style:'right', value:'undefined'},
+    {style:'bottom', value:'undefined'},
   ].forEach(function(item) {
     assert(item.value === getDefaultStyleValue(item.style),
         item.style + ' should be ' + item.value);
@@ -415,6 +415,15 @@ function getDefaultStyleValue(style) {
   if (style == 'position') {
     return 'relative';
   }
+  switch (style) {
+    case 'left':
+    case 'top':
+    case 'right':
+    case 'bottom':
+    case 'start':
+    case 'end':
+      return 'undefined';
+  }
   var node = document.getElementById('default');
   return getComputedStyle(node, null).getPropertyValue(style);
 }
diff --git a/java/tests/com/facebook/csslayout/CSSLayoutAbsolutePositionTest.java b/java/tests/com/facebook/csslayout/CSSLayoutAbsolutePositionTest.java
index c64be24e..f3703e70 100644
--- a/java/tests/com/facebook/csslayout/CSSLayoutAbsolutePositionTest.java
+++ b/java/tests/com/facebook/csslayout/CSSLayoutAbsolutePositionTest.java
@@ -27,7 +27,7 @@
 </div>
 
 <div id="do_not_clamp_height_of_absolute_node_to_height_of_its_overflow_hidden_parent" style="height: 50px; width: 50px; overflow: hidden; flex-direction: row;">
-  <div style="position: absolute; start: 0; top: 0;">
+  <div style="position: absolute; start: 0px; top: 0px;">
     <div style="width: 100px; height: 100px;"></div>
   </div>
 </div>
@@ -213,6 +213,8 @@ public class CSSLayoutAbsolutePositionTest {
 
     final CSSNode root_child0 = new CSSNode();
     root_child0.setPositionType(CSSPositionType.ABSOLUTE);
+    root_child0.setPosition(Spacing.START, 0);
+    root_child0.setPosition(Spacing.TOP, 0);
     root.addChildAt(root_child0, 0);
 
     final CSSNode root_child0_child0 = new CSSNode();
diff --git a/tests/CSSLayoutAbsolutePositionTest.cpp b/tests/CSSLayoutAbsolutePositionTest.cpp
index d817b6ff..92fd8f0f 100644
--- a/tests/CSSLayoutAbsolutePositionTest.cpp
+++ b/tests/CSSLayoutAbsolutePositionTest.cpp
@@ -27,7 +27,7 @@
 </div>
 
 <div id="do_not_clamp_height_of_absolute_node_to_height_of_its_overflow_hidden_parent" style="height: 50px; width: 50px; overflow: hidden; flex-direction: row;">
-  <div style="position: absolute; start: 0; top: 0;">
+  <div style="position: absolute; start: 0px; top: 0px;">
     <div style="width: 100px; height: 100px;"></div>
   </div>
 </div>
@@ -204,6 +204,8 @@ TEST(CSSLayoutTest, do_not_clamp_height_of_absolute_node_to_height_of_its_overfl
 
   const CSSNodeRef root_child0 = CSSNodeNew();
   CSSNodeStyleSetPositionType(root_child0, CSSPositionTypeAbsolute);
+  CSSNodeStyleSetPosition(root_child0, CSSEdgeStart, 0);
+  CSSNodeStyleSetPosition(root_child0, CSSEdgeTop, 0);
   CSSNodeInsertChild(root, root_child0, 0);
 
   const CSSNodeRef root_child0_child0 = CSSNodeNew();