diff --git a/cobalt/black_box_tests/black_box_tests.py b/cobalt/black_box_tests/black_box_tests.py
index 7dc6fd7ab359..98430bda0f22 100755
--- a/cobalt/black_box_tests/black_box_tests.py
+++ b/cobalt/black_box_tests/black_box_tests.py
@@ -78,6 +78,7 @@
'disable_eval_with_csp',
'h5vcc_storage_write_verify_test',
'http_cache',
+ 'javascript_profiler',
'persistent_cookie',
'scroll',
'service_worker_add_to_cache_test',
diff --git a/cobalt/black_box_tests/testdata/javascript_profiler.html b/cobalt/black_box_tests/testdata/javascript_profiler.html
new file mode 100644
index 000000000000..f268510db49a
--- /dev/null
+++ b/cobalt/black_box_tests/testdata/javascript_profiler.html
@@ -0,0 +1,88 @@
+
+
+
+ JavaScript Profiler Test
+
+
+
+
+
+
diff --git a/cobalt/black_box_tests/tests/javascript_profiler.py b/cobalt/black_box_tests/tests/javascript_profiler.py
new file mode 100644
index 000000000000..33dabc7a0821
--- /dev/null
+++ b/cobalt/black_box_tests/tests/javascript_profiler.py
@@ -0,0 +1,40 @@
+# Copyright 2024 The Cobalt Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Tests if Cobalt client page can use window.Profiler."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from cobalt.black_box_tests import black_box_tests
+from cobalt.black_box_tests.threaded_web_server import ThreadedWebServer
+
+
+class JavaScriptProfilerTest(black_box_tests.BlackBoxTestCase):
+ """Ensure that the client can declare a `window.Profiler` object."""
+
+ def test_javascript_profiler_prime_profiler(self):
+ with ThreadedWebServer(binding_address=self.GetBindingAddress()) as server:
+ modes = [
+ 'testPrimeProfiler',
+ 'testSampleBufferFullProfiler',
+ 'testAbruptGarbageCollection',
+ ]
+ for mode in modes:
+ url = server.GetURL(
+ file_name=f'testdata/javascript_profiler.html?mode={mode}')
+ with self.CreateCobaltRunner(url=url) as runner:
+ runner.WaitForJSTestsSetup()
+ self.assertTrue(runner.JSTestsSucceeded(),
+ f'JavaScript profiler failed at case mode="{mode}".')