tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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iframe-messagechannel-failure.html (343B)

      1 <!DOCTYPE html>
      2 <script>
      3  const channel = new MessageChannel();
      4  window.parent.postMessage(channel.port2, '*', [channel.port2]);
      5  channel.port1.onmessage = e => { alert(e.data); channel.port1.postMessage("message event received") };
      6  channel.port1.onmessageerror = () => channel.port1.postMessage("messageerror event received");
      7 </script>