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diff --git a/js/src/tests/js1_3/extensions/proto_10.js b/js/src/tests/js1_3/extensions/proto_10.js
new file mode 100644
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+++ b/js/src/tests/js1_3/extensions/proto_10.js
@@ -0,0 +1,122 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          proto_10.js
+   Section:
+   Description:        Determining Instance Relationships
+
+   This tests Object Hierarchy and Inheritance, as described in the document
+   Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
+   15:19:34 on http://devedge.netscape.com/.  Current URL:
+   http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm
+
+   This tests the syntax ObjectName.prototype = new PrototypeObject using the
+   Employee example in the document referenced above.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+
+var SECTION = "proto_10";
+var VERSION = "JS1_3";
+var TITLE   = "Determining Instance Relationships";
+
+startTest();
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+function InstanceOf( object, constructor ) {
+  while ( object != null ) {
+    if ( object == constructor.prototype ) {
+      return true;
+    }
+    object = object.__proto__;
+  }
+  return false;
+}
+function Employee ( name, dept ) {
+  this.name = name || "";
+  this.dept = dept || "general";
+}
+
+function Manager () {
+  this.reports = [];
+}
+Manager.prototype = new Employee();
+
+function WorkerBee ( name, dept, projs ) {
+  this.base = Employee;
+  this.base( name, dept)
+    this.projects = projs || new Array();
+}
+WorkerBee.prototype = new Employee();
+
+function SalesPerson () {
+  this.dept = "sales";
+  this.quota = 100;
+}
+SalesPerson.prototype = new WorkerBee();
+
+function Engineer ( name, projs, machine ) {
+  this.base = WorkerBee;
+  this.base( name, "engineering", projs )
+    this.machine = machine || "";
+}
+Engineer.prototype = new WorkerBee();
+
+var pat = new Engineer();
+
+new TestCase( SECTION,
+              "pat.__proto__ == Engineer.prototype",
+              true,
+              pat.__proto__ == Engineer.prototype );
+
+new TestCase( SECTION,
+              "pat.__proto__.__proto__ == WorkerBee.prototype",
+              true,
+              pat.__proto__.__proto__ == WorkerBee.prototype );
+
+new TestCase( SECTION,
+              "pat.__proto__.__proto__.__proto__ == Employee.prototype",
+              true,
+              pat.__proto__.__proto__.__proto__ == Employee.prototype );
+
+new TestCase( SECTION,
+              "pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
+              true,
+              pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );
+
+new TestCase( SECTION,
+              "pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
+              true,
+              pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );
+
+
+new TestCase( SECTION,
+              "InstanceOf( pat, Engineer )",
+              true,
+              InstanceOf( pat, Engineer ) );
+
+new TestCase( SECTION,
+              "InstanceOf( pat, WorkerBee )",
+              true,
+              InstanceOf( pat, WorkerBee ) );
+
+new TestCase( SECTION,
+              "InstanceOf( pat, Employee )",
+              true,
+              InstanceOf( pat, Employee ) );
+
+new TestCase( SECTION,
+              "InstanceOf( pat, Object )",
+              true,
+              InstanceOf( pat, Object ) );
+
+new TestCase( SECTION,
+              "InstanceOf( pat, SalesPerson )",
+              false,
+              InstanceOf ( pat, SalesPerson ) );
+test();