Is it considered bad practice to use non-standard HTML attributes?

Posted by user198729 on Stack Overflow See other posts from Stack Overflow or by user198729
Published on 2010-01-22T14:39:02Z Indexed on 2010/04/05 8:13 UTC
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JavaScript

I find it very convenient to set arbitary attributes like:

<a stackoverflowId="123">...</a>

And in JavaScript:

var soId = $selectofA.attr('stackoverflowId'); //jQuery

Is it a good practice at all? I've never had a problem with this yet.

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