[NFBCS] Accessibility Overlays, what are they and can someone elaborate on them?

[Brian Buhrow]

	hello everyone.  Below is a link to a web site that behaves very
strangely on Safari with iOS and, possibly, other browsers and operating
systems as well.  The behavior is as follows: 

	the first time you open it, the site works beautifully with VoiceOver.

Then , the second time you open it, and every time there after, it goes
into a mode where VoiceOver can see no links at all and it says something
about using the website in screen reader mode.  There is nothing to click
on and nothing to get out of that page.  Visually, the sentence about Using
the website in screen reader mode does not appear and, if you turn off
voiceover, you can use the web site just fine.

A friend of mine suggested this might be due to something called an
accessibility overlay, which is loaded with the page and renders the page
useless with VoiceOver.  More confusingly, however, it seems to only get
loaded after the page has been loaded and used once.  I assume this is due
to the page seeing some stored cookie somewhere, but I don't actually know.

	So, my questions are: what is an accessibility overlay?  Who makes and
sells them and how often are they used?

	Finally, can someone talk about how they work in general terms and,
perhaps, give an example of one that works well and is well supported?
I've never heard of these things before and I'd like to know more about
them and how to use them, avoide them, etc.  So, any thoughts or discussion
would be greatly appreciated.

-thanks
-Brian

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