Hi João.
João Eiras:
> It does not make sense to be only an object, because you can only have
> instances of functions and the instanceof operator requires a function
> on the right hand side. That ff3 thing might be a regression.
That’s not true. This is what ECMA-262 says the behaviour of
‘RelationalExpression instanceof ShiftExpression’ should be:
1. Evaluate RelationalExpression.
2. Call GetValue(Result(1)).
3. Evaluate ShiftExpression.
4. Call GetValue(Result(3)).
5. If Result(4) is not an object, throw a TypeError exception.
6. If Result(4) does not have a [[HasInstance]] method, throw a
TypeError exception.
7. Call the [[HasInstance]] method of Result(4) with parameter
Result(2).
8. Return Result(7).
So all that is needed for something like ‘document instanceof
HTMLDocument’ to work is for the HTMLDocument interface object to
implement [[HasInstance]] (which is what section 4.2.1.1 requires).
Cameron
--
Cameron McCormack, http://mcc.id.au/
xmpp:[EMAIL PROTECTED] ▪ ICQ 26955922 ▪ MSN [EMAIL PROTECTED]
