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-rw-r--r--python/servo/testing_commands.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index 57676377a7c..6aeb176c040 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -72,6 +72,8 @@ def create_parser_wpt():
help="Run under chaos mode in rr until a failure is captured")
parser.add_argument('--pref', default=[], action="append", dest="prefs",
help="Pass preferences to servo")
+ parser.add_argument('--layout-2020', default=False, action="store_true",
+ help="Use expected results for the 2020 layout engine")
parser.add_argument('--always-succeed', default=False, action="store_true",
help="Always yield exit code of zero")
return parser