HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .parents('ul')</title>

  <style>

    .ancestor-list { outline: 2px solid #2196f3; background: #e8f4ff; }

  </style>

</head>

<body>

  <ul>

    <li>I</li>

    <li>II

      <ul>

        <li class="item-a">A</li>

        <li>B</li>

      </ul>

    </li>

  </ul>

  <p>Both inner and outer ul get .ancestor-list.</p>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("li.item-a").parents("ul").addClass("ancestor-list");

  </script>

</body>

</html>

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jQuery .parents('ul') — filter ancestors (Try It)