So what if custom HTML attributes aren't valid XHTML?

Posted by Constantine on Stack Overflow See other posts from Stack Overflow or by Constantine
Published on 2009-06-15T07:26:41Z Indexed on 2010/05/15 10:14 UTC
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html

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XHTML

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valid-xhtml

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unobtrusive-javascript

I know that is the reason some people don't approve of them, but does it really matter? I think that the power that they provide, in interacting with JavaScript and storing and sending information from and to the server, outweighs the validation concern. Am I missing something? What are the ramifications of "invalid" HTML? And wouldn't a custom DTD resolve them anyway?

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