iframe-messagechannel-site-failure.html (328B)
1 <!DOCTYPE html> 2 <script> 3 const channel = new MessageChannel(); 4 window.parent.postMessage(channel.port2, '*', [channel.port2]); 5 channel.port1.onmessage = e => { channel.port1.postMessage("message event received") }; 6 channel.port1.onmessageerror = () => channel.port1.postMessage("messageerror event received"); 7 </script>