jQuery addback Method Live Example

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<div class="left">
  <p><strong>Before <code>addBack()</code></strong></p>
  <div class="before-addback">
    <p>First Paragraph</p>
    <p>Second Paragraph</p>
  </div>
</div>
<div class="right">
  <p><strong>After <code>addBack()</code></strong></p>
  <div class="after-addback">
    <p>First Paragraph</p>
    <p>Second Paragraph</p>
  </div>
</div>
<script>
$( "div.left, div.right" ).find( "div, div > p" ).addClass( "border" );
// First Example
$( "div.before-addback" ).find( "p" ).addClass( "background" );
// Second Example
$( "div.after-addback" ).find( "p" ).addBack().addClass( "background" );
</script>

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