The LONGDESC Attribute
The longdesc attribute of the IMG element contains a link to a file describing the image in detail, for those times where the image cannot be downloaded or displayed (for whatever reason that may be), or for times where a textual description would be better than the image itself.
The browser may supply some way of accessing this information.
How many of you use this feature? Do you think it is a good idea?
I've only ever used the feature once. It is useful if you want to add notes to an image in an artist's gallery for example. Most images on a site seem to be more than adequately handled by alt and title attributes.
According to htmlhelp.com, you could use LONGDESC to provide a detailed description of an image so that blind and other text-only users can develop a mental picture of it. It's supposed to complement ALT, and I can see the benefits. Haven't had a chance to use it yet, though.
That was my point, most images on web pages don't need describing in any great detail. Screenshots are another use I can think of.
I employ it when I can, but I don't know if any visitor will use it, though. Are there any browsers that currently support it?
When I do use it, though, I also use a complementary d-link (or link the image itself), too. :-)