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Can we use any extension in or only HTML is allowed by W3C? and how LONGDESC link should be open , only as new windows or can we open Longdesc url in popup or lightbox?
Does LONGDESC have any benefit for Site SEO?
The specification doesn’t mandate what type of resource should be at the other end of the URI, but an HTML document is most sensible
I’d set up a longdesc and then leave it alone. I wouldn’t go near it with JavaScript. New windows and lightboxes are accessibility barriers and should be avoided at the best of times — that goes double when the resource is designed primarily for the benefit of those needing assistive technology.
Possibly. Search engines don’t publicize the details of their algorithms. As a rule of thumb “Forget about SEO. Design for users and trust search engines to do their job.”. Again, this goes double when implementing an accessibility feature.