Naming "class" and "id" HTML attributes - dashes vs. underlines

Posted by Emanuil on Stack Overflow See other posts from Stack Overflow or by Emanuil
Published on 2009-11-08T15:28:55Z Indexed on 2010/04/04 16:43 UTC
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<div id="example-value"> or <div id="example_value">?

This site and Twitter use the first style. Facebook and Vimeo - the second.

Which one do you use and why?

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