diff --git a/components/style/list_properties.py b/components/style/list_properties.py
new file mode 100644
index 00000000000..63bbe247511
--- /dev/null
+++ b/components/style/list_properties.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os.path
+import sys
+import json
+
+style = os.path.dirname(__file__)
+sys.path.insert(0, os.path.join(style, "Mako-0.9.1.zip"))
+from mako.template import Template
+
+template = Template(filename=os.path.join(style, "properties.mako.rs"), input_encoding='utf8')
+template.render()
+properties = dict(
+    (p.name, {
+        "flag": p.experimental,
+        "shorthand": hasattr(p, "sub_properties")
+    })
+    for p in template.module.LONGHANDS + template.module.SHORTHANDS
+)
+print(json.dumps(properties, indent=4))
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index 9892a0e6669..acd92dea9a2 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -15,6 +15,7 @@ import sys
 import os
 import os.path as path
 import subprocess
+import json
 from collections import OrderedDict
 from time import time
 
@@ -158,6 +159,14 @@ class MachCommands(CommandBase):
     @CommandArgument('test_name', nargs=argparse.REMAINDER,
                      help="Only run tests that match this pattern or file path")
     def test_unit(self, test_name=None, package=None):
+        properties = json.loads(subprocess.check_output([
+            sys.executable,
+            path.join(self.context.topdir, "components", "style", "list_properties.py")
+        ]))
+        assert len(properties) >= 100
+        assert "margin-top" in properties
+        assert "margin" in properties
+
         if test_name is None:
             test_name = []