d_interfaces())
            {
                test_true(false,
                          "The User Timing and Performance Timeline interfaces, which are required for this test, " +
                          "are defined.");

                done();
            }
            else
            {
                // create measures using the test delay
                setTimeout(measure_test_cb, measureTestDelay);
            }
        }

        function measure_test_cb()
        {
            // create the tes