I'm not sure what the exact process is for this, nor the right target (and the relevant product might well be HTML.Next). But there is a valid spec for the longdesc attribute on the img element, so this use of the attribute should be removed from the "authors must not use" section.
From a process point of view I think this will happen when this extension spec is merged into either HTML5.0 or HTML5.1 or even both. I think it's a bit early now.
Hmm. I think there is a difference between saying what the final state is - I agree we are way too early for that - and saying "users must not use it" which is what the HTML spec currently says.
If that statement remains, I think it should at least point to the extensions spec since they are in straight contradiction.
(In reply to comment #2)
> Hmm. I think there is a difference between saying what the final state is -
> I agree we are way too early for that - and saying "users must not use it"
> which is what the HTML spec currently says.
> If that statement remains, I think it should at least point to the
> extensions spec since they are in straight contradiction.
Yes, the agreed plan was that we'd point to it and move towards validity. I'll look into handling that.
fair enough :-)
I actually think we should keep this note. The validator(s) can simply ignore the note if they consider the HTML Image Description Extension spec to be an applicable specification.
I believe the following quote from Plan 2014  applies to this situation and should clear up any doubt that longdesc should not be listed as obsolete:
> To prevent unnecessary confusion, the HTML5 specification will drop explicit
> indications that any given extension is obsolete once an extension specification
> exists that has been published as a FPWD. Additionally, the W3C staff will watch
> for drafts being published and keep the W3C validator up to date as appropriate.
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Change Description: Removed longdesc from the list of obsolete attributes.
Rationale: There's an extension spec for that.