<img usemap> should be interactive (detailed review of Semantics)

(This is part of my detailed review of Semantics and structure of HTML  
elements section.)

In order to ban nesting of image maps in other interactive elements (like  
buttons), <img> should be classified as an interactive element when it has  
the usemap attribute specified.

(At the face of it, it seems to make sense to classify <area> (or <map>)  
as interactive, but it's actually the image you're interacting with and  
nesting <area>s (or <map>s) in other interactive elements does not cause  
any problems AFAICT.)

-- 
Simon Pieters
Opera Software