HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>li .is(alt collection)</title>
  <style>
    li { cursor: pointer; padding: 4px; }
  </style>
</head>
<body>
  <ul id="browsers">
    <li>Chrome</li>
    <li>Safari</li>
    <li>Firefox</li>
    <li>Opera</li>
  </ul>
  <p>Cyan items (even) slide up; others turn red.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var alt = $("#browsers li:nth-child(2n)").css("background", "#0ff");
    $("li").on("click", function () {
      var li = $(this);
      if (li.is(alt)) {
        li.slideUp();
      } else {
        li.css("background", "red");
      }
    });
  </script>
</body>
</html>

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jQuery li .is(jQuery collection) (Try It)