sub_capture_mailman.html | Explore in Territory

<html>
  <head>
    <title>Region Capture Mailman</title>
    <link rel="icon" href="data:," />
    <script>
      "use strict";

      function reportEmbeddingSuccess() {
        window.parent.postMessage({messageType: "mailman-embedded"}, "*");
      }

      const cropTargetBc = new BroadcastChannel("cropTargetBc");

      // Forward all messages from parent to the BroadcastChannel.
      window.addEventListener("message", (event) => {
        cropTargetBc.postMessage(event.data, "*");
      });

      // Forward all messages from the BroadcastChannel to the parent.
      cropTargetBc.onmessage = (msg) => {
        window.parent.postMessage(msg.data, "*");
      }
    </script>
  </head>
  <body onload="reportEmbeddingSuccess();">
  </body>
</html>

chromium/chrome/test/data/webrtc/sub_capture_mailman.html