Примеры для jQuery .offsetParent()

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Find the offsetParent of item "A."

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>offsetParent demo</title>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<ul class="level-1">
  <li class="item-i">I</li>
  <li class="item-ii" style="position: relative;">II
    <ul class="level-2">
      <li class="item-a">A</li>
      <li class="item-b">B
        <ul class="level-3">
          <li class="item-1">1</li>
          <li class="item-2">2</li>
          <li class="item-3">3</li>
        </ul>
      </li>
      <li class="item-c">C</li>
    </ul>
  </li>
  <li class="item-iii">III</li>
</ul>
 
<script>$( "li.item-a" ).offsetParent().css( "background-color", "red" );</script>
 
</body>
</html>

Демонстрация: