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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>document.hidden read</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      String(document.hidden) + "\n" +
      "visible? " + (document.hidden === false);
  </script>
</body>
</html>

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document.hidden — read value (Try It)