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diff --git a/testing/web-platform/tests/webmessaging/without-ports/009.html b/testing/web-platform/tests/webmessaging/without-ports/009.html
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+++ b/testing/web-platform/tests/webmessaging/without-ports/009.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<title>zero arguments</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+ assert_throws_js(TypeError, function() {
+ postMessage();
+ });
+});
+</script>