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diff --git a/testing/web-platform/tests/webmessaging/with-ports/017.html b/testing/web-platform/tests/webmessaging/with-ports/017.html
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+<!doctype html>
+<title>origin of the script that invoked the method, about:blank</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe src="about:blank"></iframe>
+<div id=log></div>
+<script>
+async_test(function() {
+ window[0].postMessage('', '*', []);
+ window[0].onmessage = this.step_func(function(e) {
+ assert_equals(e.origin, location.protocol + '//' + location.host);
+ assert_array_equals(e.ports, []);
+ this.done();
+ });
+});
+</script>
+
+