HTML Code

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

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fullscreenEnabled — read value (Try It)