File: portal-host-cross-origin.sub.html

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firefox-esr 68.10.0esr-1~deb9u1
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<!DOCTYPE html>
<body>
  <script>
    let forwardingIframe = document.createElement('iframe');
    let channelName = new URL(location).searchParams.get('broadcastchannel');
    forwardingIframe.src = `http://{{host}}:{{ports[http][0]}}/portals/resources/portal-forward-with-broadcast.html?broadcastchannel=${channelName}`;
    forwardingIframe.onload = () => {
      let message = {
        hasHost: !!window.portalHost
      };
      forwardingIframe.contentWindow.postMessage(message, '*');
    }
    document.body.appendChild(forwardingIframe);
  </script>
</body>