testing/web-platform/tests/webmessaging/broadcastchannel/resources/origin.html


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<script>
const bc1 = new BroadcastChannel("ladila"),
      bc2 = new BroadcastChannel("ladila");
bc2.onmessage = e => {
  parent.postMessage(e.origin, "*");
}
bc1.postMessage("does not matter");
</script>