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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clone tracks</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var canvas = document.createElement("canvas");
    var original = canvas.captureStream();
    var copy = original.clone();
    var origTrack = original.getVideoTracks()[0];
    var copyTrack = copy.getVideoTracks()[0];
    document.getElementById("out").textContent =
      "same track ref: " + (origTrack === copyTrack) + "\n" +
      "same track id: " + (origTrack.id === copyTrack.id);
  </script>
</body>
</html>

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clone() — cloned track objects (Try It)