Index: SimpleTestHarness/sth.js
===================================================================
--- SimpleTestHarness/sth.js	(revision 58934)
+++ SimpleTestHarness/sth.js	(working copy)
@@ -108,7 +108,7 @@
     pres = true;
     if (pre !== undefined) {
       try {
-        pres = pre.call(ut.testObj);
+        pres = pre.call(ut.thisObj);
         restoreGlobals();
         if (pres !== true) {
           ut.res = 'Precondition failed';
@@ -124,7 +124,7 @@
     // if the prereq is met, run the testcase now.
     if (pres === true) {
       try {
-        res = ut.theTestcase.call(ut.testObj);
+        res = ut.theTestcase.call(ut.thisObj);
         restoreGlobals();
         if (res === true) {
           ut.res = 'pass';
@@ -276,10 +276,12 @@
   this.resultsDiv       = null
 }
 
+var _globalThis = this;
 function sth_test(to,  path) {
   //Create a sth_test from a test definition object, and path
   //TODO:  Update sth framework to work more directly with test definitiion objects.
   this.testObj     = to;
+  this.thisObj     = to.globalThis === true ? _globalThis : to;
   this.description = to.description;
   this.theTestcase = to.test;
   this.path        = path;
@@ -349,4 +351,4 @@
   }
   
   return true;
-}
\ No newline at end of file
+}
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-178.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-178.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-178.js	(working copy)
@@ -41,5 +41,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-12.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-12.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-12.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-6.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-6.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-6.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-9.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-9.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-9.js	(working copy)
@@ -38,5 +38,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-179.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-179.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-179.js	(working copy)
@@ -41,5 +41,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-10.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-10.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-10.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-4.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-4.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-4.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-180.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-180.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-180.js	(working copy)
@@ -41,5 +41,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-13.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-13.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-13.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-11.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-11.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-11.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-5.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-5.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-5.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-181.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-181.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-181.js	(working copy)
@@ -41,5 +41,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });
Index: TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-8.js
===================================================================
--- TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-8.js	(revision 58934)
+++ TestCases/chapter15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-8.js	(working copy)
@@ -43,5 +43,7 @@
 
 precondition: function prereq() {
   return fnExists(Object.getOwnPropertyDescriptor);
- }
+ },
+
+globalThis: true
 });