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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hidden vs visibilityState</title>
</head>
<body>
  <p>Switch tabs to compare values.</p>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    function logVisibility() {
      out.textContent = JSON.stringify({
        hidden: document.hidden,
        state: document.visibilityState
      }, null, 2);
    }
    document.addEventListener("visibilitychange", logVisibility);
    logVisibility();
  </script>
</body>
</html>

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hidden vs visibilityState (Try It)