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diff --git a/testing/web-platform/tests/webmessaging/with-ports/016.html b/testing/web-platform/tests/webmessaging/with-ports/016.html
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--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/with-ports/016.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<title>origin of the script that invoked the method, data:</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe src="data:text/html,<script>onmessage = function(e) { parent.postMessage(e.origin, '*'); }; parent.postMessage('loaded', '*');</script>"></iframe>
+<div id=log></div>
+<script>
+async_test(function() {
+ onmessage = this.step_func(function(e) {
+ if (e.data === 'loaded') {
+ window[0].postMessage('', '*');
+ return;
+ }
+
+ assert_equals(e.data, location.protocol + '//' + location.host);
+ assert_equals(e.origin, 'null');
+ assert_array_equals(e.ports, []);
+ this.done();
+ });
+});
+</script>
+
+