diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.4/11.4.1/11.4.1-5-a-28-s.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.4/11.4.1/11.4.1-5-a-28-s.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/// Copyright (c) 2012 Ecma International.  All rights reserved. 
+/// Ecma International makes this code available under the terms and conditions set
+/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
+/// "Use Terms").   Any redistribution of this code must retain the above 
+/// copyright and this notice and otherwise comply with the Use Terms.
+/**
+ * @path ch11/11.4/11.4.1/11.4.1-5-a-28-s.js
+ * @description Strict Mode - TypeError is thrown when deleting RegExp.length
+ * @onlyStrict
+ */
+
+
+function testcase() {
+    "use strict";
+    var a = new RegExp();
+    try {
+        var b = delete RegExp.length;
+        return false;
+    } catch (e) {
+        return e instanceof TypeError;
+    }
+}
+runTestCase(testcase);