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Description
This to me is not so much about the longdesc attribute as much as the format of the html5 spec in general. The decision was made ( which i agree with ) to modularize the HTML spec and reference extension specs from it.
The main difference i see here is that this takes the modularization a step further as this is just an attribute it seems a bit much, to need to got to and reference another document, just for an attribute. I would like to hear others opinions on the usability of this pattern.
There has been some pretty heated discussion in the issue already i highly recommend reading up on.