third_party/web_platform_tests/resources/examples/apisample14.html - cobalt - Git at Google

 <!DOCTYPE HTML>
 <html>
 <head>
 <title>Dedicated Worker Tests</title>
 <script src="../testharness.js"></script>
 <script src="../testharnessreport.js"></script>
 </head>
 <body>
 <h1>Dedicated Web Worker Tests</h1>
 <p>Demonstrates running <tt>testharness</tt> based tests inside a dedicated web worker.
 <p>The test harness is expected to fail due to an uncaught exception in one worker.</p>
 <div id="log"></div>

 <script>
 test(function(t) {
         assert_true("Worker" in self, "Browser should support Workers");
     },
     "Browser supports Workers");

 fetch_tests_from_worker(new Worker("apisample-worker.js"));

 fetch_tests_from_worker(new Worker("apisample-error-worker.js"));

 test(function(t) {
         assert_false(false, "False is false");
     },
     "Test running on main document.");
 </script>
 </body>
	<!DOCTYPE HTML>
	<html>
	<head>
	<title>Dedicated Worker Tests</title>
	<script src="../testharness.js"></script>
	<script src="../testharnessreport.js"></script>
	</head>
	<body>
	<h1>Dedicated Web Worker Tests</h1>
	<p>Demonstrates running <tt>testharness</tt> based tests inside a dedicated web worker.
	<p>The test harness is expected to fail due to an uncaught exception in one worker.</p>
	<div id="log"></div>

	<script>
	test(function(t) {
	assert_true("Worker" in self, "Browser should support Workers");
	},
	"Browser supports Workers");

	fetch_tests_from_worker(new Worker("apisample-worker.js"));

	fetch_tests_from_worker(new Worker("apisample-error-worker.js"));

	test(function(t) {
	assert_false(false, "False is false");
	},
	"Test running on main document.");
	</script>
	</body>