testing/web-platform/tests/mediacapture-streams/support/iframe-MediaStreamTrack-transfer.html


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<!DOCTYPE html>
<html>
  <head>
    <title>iframe</title>
    <script>
      function onMsg(e) {
        if(e.data instanceof MediaStreamTrack) {
          parent.postMessage({result: 'Success'});
        } else {
          parent.postMessage({
            result: 'Failure',
            error: `${e.data} is not a MediaStreamTrack`
          });
        }
      }
      window.addEventListener("message", onMsg);
    </script>
  </head>
  <body>
  </body>
</html>