[whatwg] Space characters

Is there a reason why the definition of space characters does not  
match the XML 1.0 and RELAX NG definition of white space (space, tab,  
CR, LF) but also includes (line tabulation and form feed)? Is the  
deviation from XML 1.0 needed for backwards compatibility with text/ 
html UAs?

-- 
Henri Sivonen
hsivonen at iki.fi
http://hsivonen.iki.fi/