[whatwg] Toggling Attributes

[Christoph Päper]

Ian Hickson (2009-02-13):
> There are three of these attributes so far:
>
>   autocomplete = on/off
>   contenteditable = true/false
>   draggable = true/false

It would be nice, actually, from an author perspective at least, if  
all of these worked for all applicable attributes:

   <foo bar>
   <foo bar=bar>
   <foo bar=on>
   <foo bar=true>
   <foo bar=1>*

   <foo>*
   <foo bar="">*
   <foo bar=off>
   <foo bar=false>
   <foo bar=0>*

* I am not completely sure about the ones marked with an asterisk,  
because digits may not be necessary and the default or inherited  
state may be 'enabled'.