HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mimeTypes — compare</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var hasPdfMime = "application/pdf" in navigator.mimeTypes;
    var pdfEnabled = Boolean(navigator.pdfViewerEnabled);
    document.getElementById("out").textContent =
      "application/pdf in mimeTypes: " + hasPdfMime +
      "\npdfViewerEnabled: " + pdfEnabled +
      "\nPrefer pdfViewerEnabled for new PDF UI decisions";
  </script>
</body>
</html>

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mimeTypes vs pdfViewerEnabled (Try It)