HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>document Escape shortcut</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    button { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; margin-bottom: 12px; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; box-sizing: border-box; margin-bottom: 12px; }
    #panel { display: none; padding: 16px; background: #eff6ff; border: 2px solid #2563eb; border-radius: 8px; }
    #panel.is-open { display: block; }
    #hint { color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="open">Open panel</button>
  <input type="text" placeholder="Focus here, then press Escape">
  <div id="panel"><strong>Panel open</strong> — press Escape to close.</div>
  <p id="hint">Escape works even when the input above has focus.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#open").on("click", function() {
      $("#panel").addClass("is-open");
    });
    $(document).on("keydown", function(event) {
      if (event.which === 27) {
        $("#panel").removeClass("is-open");
      }
    });
  </script>
</body>
</html>

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jQuery keydown — document Escape closes panel (Try It)