HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>requestFullscreen navigationUI</title>
</head>
<body>
  <p>Click the button to fullscreen the page with navigation UI visible.</p>
  <button type="button" id="go">Fullscreen page</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("go").addEventListener("click", function () {
      document.documentElement.requestFullscreen({ navigationUI: "show" })
        .then(function () {
          document.getElementById("out").textContent = "Fullscreen with navigation UI";
        })
        .catch(function (err) {
          document.getElementById("out").textContent = err.name + ": " + err.message;
        });
    });
  </script>
</body>
</html>

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Element.requestFullscreen — navigationUI (Try It)