Re: Allowing unknown pseudo classes and unknown pseudo element in the selector.

On 3/8/12 12:52 PM, Erik Arvidsson wrote:
> Today we don't drop the whole rule for unknown tag names, attribute
> names etc.

That's at least in part because the syntax of tag names and attribute 
names is known and fixed.

The syntax of unknown pseudo-elements is ... unknown.  nothing says they 
have to be restricted to things of the form ::[a-z0-9-]*.

-Boris