HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>multi-select metaKey</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 24rem; }
    #list { list-style: none; padding: 0; margin: 0; }
    #list li { padding: 10px 14px; margin: 4px 0; background: #f1f5f9; border-radius: 6px; cursor: pointer; }
    #list li.selected { background: #2563eb; color: #fff; }
    p.hint { font-size: 13px; color: #64748b; margin-top: 12px; }
  </style>
</head>
<body>
  <ul id="list">
    <li>Alpha</li>
    <li>Bravo</li>
    <li>Charlie</li>
  </ul>
  <p class="hint">Cmd/Ctrl+click to multi-select; plain click selects one.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#list").on("click", "li", function (event) {
      if (!event.metaKey && !event.ctrlKey) {
        $("#list li").removeClass("selected");
      }
      $(this).toggleClass("selected");
    });
  </script>
</body>
</html>

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jQuery event.metaKey — multi-select list (Try It)