src/third_party/web_platform_tests/webmessaging/without-ports/008.html - cobalt - Git at Google

 <!doctype html>
 <title>just one argument</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <div id="log"></div>
 <script>
 test(function() {
   assert_throws(new TypeError(), function() {
     postMessage('');
   });
 });
 </script>
	<!doctype html>
	<title>just one argument</title>
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<div id="log"></div>
	<script>
	test(function() {
	assert_throws(new TypeError(), function() {
	postMessage('');
	});
	});
	</script>