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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mediaSession — playbackState</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    if (!("mediaSession" in navigator)) {
      document.getElementById("out").textContent = "Media Session API missing";
    } else {
      navigator.mediaSession.playbackState = "playing";
      var a = navigator.mediaSession.playbackState;
      navigator.mediaSession.playbackState = "paused";
      var b = navigator.mediaSession.playbackState;
      document.getElementById("out").textContent =
        "state: " + a + "\nstate: " + b;
    }
  </script>
</body>
</html>

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mediaSession — playbackState (Try It)