Is it poor form to use class attributes with no corresponding css rule?

Posted by CRice on Stack Overflow See other posts from Stack Overflow or by CRice
Published on 2010-05-14T05:58:10Z Indexed on 2010/05/14 6:04 UTC
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For example if I wanted to select some elements with a certain class using jQuery, and for that reason only, is it always expected that those classes SHOULD be defined in the css?.

<div class="xyz">
something
</div>

<div class="xyz">
something else
</div>

//with example jQuery
$(".xyz").hide();

//is it wrong no element 'xyz' is defined in css?

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