HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getClientRects hidden</title>
  <style>
    .hidden-box { display: none; }
    .visible-box { padding: 12px; background: #7c3aed; color: #fff; margin: 24px; }
  </style>
</head>
<body>
  <div class="hidden-box">Hidden</div>
  <div class="visible-box">Visible</div>
  <pre id="out"></pre>
  <script>
    var hidden = document.querySelector(".hidden-box");
    var visible = document.querySelector(".visible-box");
    document.getElementById("out").textContent =
      "hidden length: " + hidden.getClientRects().length + "\n" +
      "visible length: " + visible.getClientRects().length;
  </script>
</body>
</html>

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Element.getClientRects — display none (Try It)