I looked it up and it says: Add elements to the set of matched elements.
Then it gives an example:
<ul>
<li>list item 1</li>
<li>list item 2</li>
<li>list item 3</li>
</ul>
<p>a paragraph</p>
$('li').add('p').css('background-color', 'red');
doesn't that mean make the background color red for all li and p?
Thanks in advance for your reply.