jquery .add() is weird

Posted by phil on Stack Overflow See other posts from Stack Overflow or by phil
Published on 2010-06-06T05:26:22Z Indexed on 2010/06/06 5:32 UTC
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Hi folks. Why all elements turn red? I only intend to turn <p> red.

<ul>
  <li>list item 1</li>
  <li>list item 2</li>
  <li>list item 3</li>
</ul>
<p>a paragraph</p>

<script>
$('li').add('p').css('background-color', 'red');
</script>

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