[dom] Exception in DOMTokenList.add() and DOMTokenList.remove() algo

ArkadiuszMichalski has just created a new issue for =

https://github.com/whatwg/dom:

=3D=3D Exception in DOMTokenList.add() and DOMTokenList.remove() algo =3D=
=3D
I don't see (test Firefox and Chrome) that any of this two kind of =

exception is more important, what actual algorithms suggest. Maybe =

change add() to:

1. For each token in tokens, in given order, run these substeps: =

1.1 If token is the empty string, throw a SyntaxError exception.
1.2 If token contains any ASCII whitespace, then throw an =

InvalidCharacterError exception.
1.3  If token is not in tokens, append token to tokens. =

2. Run the update steps. =


and similarly for remove().

See https://github.com/whatwg/dom/issues/93