diff --git a/components/style/properties/data.py b/components/style/properties/data.py
index 0ac42b365ee..fca4b536e01 100644
--- a/components/style/properties/data.py
+++ b/components/style/properties/data.py
@@ -226,6 +226,10 @@ class Longhand(object):
         # See compute_damage for the various values this can take
         self.servo_restyle_damage = servo_restyle_damage
 
+    @staticmethod
+    def type():
+        return "longhand"
+
     def experimental(self, product):
         if product == "gecko":
             return bool(self.gecko_pref)
@@ -361,6 +365,10 @@ class Shorthand(object):
     animatable = property(get_animatable)
     transitionable = property(get_transitionable)
 
+    @staticmethod
+    def type():
+        return "shorthand"
+
     def experimental(self, product):
         if product == "gecko":
             return bool(self.gecko_pref)
@@ -392,6 +400,10 @@ class Alias(object):
         self.allowed_in_page_rule = original.allowed_in_page_rule
         self.allowed_in_keyframe_block = original.allowed_in_keyframe_block
 
+    @staticmethod
+    def type():
+        return "alias"
+
     def experimental(self, product):
         if product == "gecko":
             return bool(self.gecko_pref)