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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>appVersion — prefix</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var v = navigator.appVersion;
    var lines = [
      String(v.startsWith("5.0")),
      v.slice(0, 12)
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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appVersion — 5.0 prefix (Try It)