Check box () that violates the checked / unchecked state

Question

can anyone spread the light?

Why .toggle()does this violate the checked / unchecked state of the flag?

$('#checkbox').toggle(function(){},function(){});​

when I think he just does nothing.

crazy demonstration

_{this was taken from the comments of this answer}

Answer 1

toggle()called by two callbacks adds an event clickto the target element. The event will execute the first callback on clicks; the second - on the odd ones.

In addition, and therefore it changes behavior, according to the manual:

.preventDefault() , , , .toggle().