HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>checkVisibility display none</title>
</head>
<body>
  <div id="panel">Hidden panel</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("panel");
    el.style.display = "none";
    document.getElementById("out").textContent =
      typeof el.checkVisibility === "function"
        ? String(el.checkVisibility())
        : "checkVisibility not supported";
  </script>
</body>
</html>

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Element.checkVisibility — display none (Try It)