Is it a bad practice to add extra attributes to html elements?

Posted by burak ozdogan on Stack Overflow See other posts from Stack Overflow or by burak ozdogan
Published on 2010-04-30T12:27:59Z Indexed on 2010/04/30 12:37 UTC
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valid-html

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attributes

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custom-attributes

Hi,

Sometimes I add an attribute to some of my controls. Like:

<a href id="myLlink" isClimber="True">Chris Sharma</a>

I know it is not a valid html. But it helps me in some cases.

Is this considered as a bad practice? A friend of mine says that it is ok for Intranet environment but on internet it might not be find friendly by search engines.

If it is not a good practice, what are the best practicess?

Thanks

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