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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>MediaStream shared</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var canvas = document.createElement("canvas");
    var a = canvas.captureStream();
    var b = new MediaStream(a);
    a.getTracks()[0].stop();
    document.getElementById("out").textContent =
      "stream A active: " + a.active + "\n" +
      "stream B active: " + b.active;
  </script>
</body>
</html>

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MediaStream() — shared track stop (Try It)