[whatwg] Define Authoring Requirements for Duplicate Attributes

[Lachlan Hunt]

Hi,
   In the Writing HTML Documents section, under Attributes, the spec 
should state that attribute names need to be unique for each element, 
and that duplicate attributes are an error.  Currently, this is only 
stated in the parsing algorithm.

http://www.whatwg.org/specs/web-apps/current-work/#attributes1

-- 
Lachlan Hunt - Opera Software
http://lachy.id.au/
http://www.opera.com/