As someone who had to help "teach" JAWS about UI elements on a friend's computer back in '05-'07, accessibility should be the first concern. If anything, that

As someone who had to help "teach" JAWS about UI elements on a friend's computer back in '05-'07, accessibility should be the first concern. If anything, that's one upside to Google - the spider "sees" like a blind person. The better-crawled a page is, the more likely it is you won't lose massive page elements.