On Sat, Mar 7, 2009 at 4:03 PM, Ian Hickson i...@hixie.ch wrote:
On Sat, 7 Mar 2009, Cameron McCormack wrote:
Done:
The value of the internal [[Class]] property of a host object is
determined as follows:
* If the host object implements a single interface, then the value
of the internal [[Class]] property MUST be the identifier of
that interface.
I think it would make sense to exclude [NoPrototypeObject] interfaces from
consideration here.
Note that this still technically does not mean you can guarantee that
the NodeList returned by querySelectorAll() has [[Class]] == NodeList,
since it could be that that host object implements another interface,
which might be required by another spec, or perhaps just because the
implementation wants to.
IMHO this is a problem.
What is the problem?
I don't think that UA extensions should affect the
[[Class]], and I think that other specs should have a way (e.g.
[NoPrototypeObject]) of always making sure they don't affect the [[Class]]
of existing stuff.
An API based on interfaces (the DOM, for example), can only reflect
one interface (at most0 in the [[Class]].
What is your use case for designing a program around having to know
the [[Class]]?
Garrett
