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<head>
  <meta charset="utf-8">
  <title>getAutoplayPolicy — configure</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function configureAutoplayVideo(video) {
      if (!navigator.getAutoplayPolicy) {
        return "API missing — keep a Play button; browser decides autoplay";
      }
      var policy = navigator.getAutoplayPolicy("mediaelement");
      if (policy === "allowed") {
        return "allowed — leave video unmuted";
      }
      if (policy === "allowed-muted") {
        video.muted = true;
        return "allowed-muted — video muted so it can autoplay";
      }
      return "disallowed — show a Play button instead of autoplay";
    }
    var fakeVideo = { muted: false };
    var msg = configureAutoplayVideo(fakeVideo);
    document.getElementById("out").textContent =
      msg + "\nmuted = " + fakeVideo.muted;
  </script>
</body>
</html>

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getAutoplayPolicy — configure mute (Try It)