1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webmessaging/MessageEvent-trusted.any.js b/testing/web-platform/tests/webmessaging/MessageEvent-trusted.any.js
new file mode 100644
index 0000000000..84187eb571
--- /dev/null
+++ b/testing/web-platform/tests/webmessaging/MessageEvent-trusted.any.js
@@ -0,0 +1,32 @@
+// META: title=MessagePort message events are trusted
+
+// See also:
+// - https://github.com/whatwg/html/issues/1602
+// - https://github.com/whatwg/html/pull/1935
+
+"use strict";
+
+async_test(t => {
+  assert_true("MessageChannel" in self, "The browser must support MessageChannel");
+
+  const channel = new MessageChannel();
+
+  channel.port2.onmessage = t.step_func_done(e => {
+    assert_equals(e.isTrusted, true);
+  });
+
+  channel.port1.postMessage("ping");
+}, "With a MessageChannel and its MessagePorts");
+
+async_test(t => {
+  assert_true("BroadcastChannel" in self, "The browser must support BroadcastChannel");
+
+  const channel = new BroadcastChannel("channel name");
+
+  channel.onmessage = t.step_func_done(e => {
+    assert_equals(e.isTrusted, true);
+  });
+
+  new Worker("support/MessageEvent-trusted-worker.js");
+}, "With a BroadcastChannel");
+