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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>supportedContentEncodings aes</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    if (typeof PushManager === "undefined" || !PushManager.supportedContentEncodings) {
      out.textContent = "PushManager.supportedContentEncodings not available.";
    } else {
      out.textContent = String(
        PushManager.supportedContentEncodings.includes("aes128gcm")
      );
    }
  </script>
</body>
</html>

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supportedContentEncodings — aes128gcm (Try It)