Non-Standard Attributes on HTML Tags. Good Thing? Bad Thing? Your Thoughts?

I am a big fan of the proposed HTML 5 solution (data- prefixed attributes). Edit: I’d add that there are probably better examples for the use of custom attributes. For instance, data that a custom application will use that have no analogue in standard attributes (eg. customization for event handlers based on something that can’t necessarily be expressed in a className or id).

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