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-rw-r--r--tests/lib/css.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/lib/css.js b/tests/lib/css.js
index ab707ad2a..bd7fb49ad 100644
--- a/tests/lib/css.js
+++ b/tests/lib/css.js
@@ -1,4 +1,5 @@
( function() {
+"use strict";
function includeStyle( url ) {
document.write( "<link rel='stylesheet' href='../../../" + url + "'>" );