On Sun, 18 Oct 2009 01:01:02 +0200, Doug Schepers <[email protected]> wrote:
Hi, Anne-
Anne van Kesteren wrote (on 10/17/09 2:33 AM):
On Sat, 17 Oct 2009 01:46:56 +0200, Doug Schepers <[email protected]>
wrote:
Sorry for the tardy response.
This was an unfortunate oversight. I've now added this to the proposed
errata [1]. Please let me know if this suits your needs.
[1] http://www.w3.org/2008/12/REC-ElementTraversal-20081222-errata#S1
Didn't we explicit decide against this because you could easily feature
test it?
I don't recall that, and can't find any reference to it in the
archives... do you have a link? It's possible it was discussed in some
telcon of F2F that I don't recall, but was not minuted.
We get this request for lots of things, and often we have decided not to
support it.
In any case, I don't believe that adding a feature string is harmful or
introduces significant implementation burden. If it is reported
accurately, it is useful, and in non-browser environments, where there
may be different DOM implementations available, it is necessary for the
DOMImplementationRegistry (as Michael mentioned).
In this case, I think the spec is pretty easy to get right. So I don't see
a lot of harm coming from supporting it, although I am not convinced that
it is a brilliant way (in general) of figuring out what works -
unfortunately in complex cases there is far more likelihood of it
something only partially working, which means the feature string becomes
useful only for very simple cases.
It is possible to check whether something is supported (and how well)
without the feature string, in many cases, by testing for a method or even
testing that it does the right thing - certainly the overhead of doing
this for ElementTraversal, while non-zero and harder than checking for the
feature string is also not really complicated for most cases I can think
of. That said, it seems that the case of querying the implementation
registry probably requires a feature string.
cheers
Chaals
--
Charles McCathieNevile Opera Software, Standards Group
je parle français -- hablo español -- jeg lærer norsk
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