[whatwg] Add <input> "Switch" Type

[Qebui Nehebkau]

On Tue, Nov 19, 2013 at 9:28 PM, Jukka K. Korpela <jkorpela at cs.tut.fi> wrote:
> It would be too restrictive to require that, and an reality, things don’t
> work that way. For example, if the action consists of deleting something,
> you just can’t repeat it next.

Well, you can. Deletion is idempotent - deleting something that has
already been deleted does nothing. However, if the action a button
represents is not currently applicable, the button should be disabled;
pressing the button again doesn't need to be possible.  In any case, I
don't mean to suggest that that should be 'required', just that it is
part of the concept of a button and following it where possible is
likely a good idea if you want users to form correct conclusions about
what things will do.