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-rw-r--r--src/css/var/cssExpand.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/css/var/cssExpand.js b/src/css/var/cssExpand.js
index 9f8194dc8..dd2007c3f 100644
--- a/src/css/var/cssExpand.js
+++ b/src/css/var/cssExpand.js
@@ -1,3 +1,5 @@
define( function() {
+ "use strict";
+
return [ "Top", "Right", "Bottom", "Left" ];
} );