HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.escapeSelector .list class</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    li { padding: 6px 0; }
    .highlight { background: #fef08a; font-weight: bold; }
  </style>
</head>
<body>
  <ul>
    <li class="list">Plain class "list"</li>
    <li class=".list">Literal class ".list"</li>
    <li class="list">Another "list"</li>
    <li>No special class</li>
  </ul>
  <button type="button" id="run">Highlight .list only</button>
  <p id="msg"></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#run").on("click", function() {
      $("li").removeClass("highlight");
      $("." + $.escapeSelector(".list")).addClass("highlight");
      $("#msg").text('Highlighted elements with class attribute exactly ".list" — not plain "list".');
    });
  </script>
</body>
</html>

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jQuery.escapeSelector — class '.list' vs list (Try It)