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diff --git a/testing/web-platform/tests/IndexedDB/idbcursor_update_objectstore2.htm b/testing/web-platform/tests/IndexedDB/idbcursor_update_objectstore2.htm
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+++ b/testing/web-platform/tests/IndexedDB/idbcursor_update_objectstore2.htm
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+<!DOCTYPE html>
+<title>IDBCursor.update() - object store - attempt to modify a record in a read-only transaction</title>
+<link rel="author" title="Microsoft" href="http://www.microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support.js"></script>
+
+<script>
+    var db,
+      t = async_test(),
+      records = [ { pKey: "primaryKey_0", iKey: "indexKey_0" },
+                  { pKey: "primaryKey_1", iKey: "indexKey_1" } ];
+
+    var open_rq = createdb(t);
+    open_rq.onupgradeneeded = function(e) {
+        db = e.target.result;
+
+        var objStore = db.createObjectStore("test", { keyPath: "pKey" });
+
+        for (var i = 0; i < records.length; i++)
+            objStore.add(records[i]);
+    };
+
+    open_rq.onsuccess = function(e) {
+        var cursor_rq = db.transaction("test")
+                          .objectStore("test")
+                          .openCursor();
+
+        cursor_rq.onsuccess = t.step_func(function(e) {
+            var cursor = e.target.result;
+            assert_throws('ReadOnlyError', function() { cursor.update(cursor.value); });
+            t.done();
+        });
+    }
+
+</script>
+
+<div id="log"></div>