If, after best efforts, any page is still not accessible, provide a link to an alternative page that is accessible, has equivalent information, and is maintained with the same frequency as the inaccessible page.
The "best efforts" should be checked out thoroughly before using the "If All Else Fails" copout. At the end of this recommendation is an example of linking to an alternative page but the admonition to ascertain that its information content is equivalent to the "mother page" and that its maintenance is automatic cannot be overemphasized. In other words, the "separate but equal" should place its emphasis on the "equal" part.
Alternative pages are not a recommended practice because maintenance costs increase the likelihood that the alternative pages will become outdated.
Although essentially repeating the first part of the recommendation, it is absolutely imperative that any Web Authoring Tool, be it a standalone HTML editor or a "save to" feature of some document, emphasize that accessibility, whether for surfers with disabilities or "hands busy, eyes busy" devices, is of central importance to reaching the widest possible audience.
If alternative pages are created they must be updated as frequently as the main pages and provide equivalent information.
"What I tell you three times is true!" The user of an authoring tool should be made to feel somewhat inadequate if forced to use the following sort of markup to provide accessibility for a Web site.
LINK element) so that the browser loads it automatically. If the
user has set their default media type to "aural," "braille," or
"tty" the user agent should load the alternative page automatically.
For example:
<HEAD>
<TITLE>Welcome to the Virtual Mall!</TITLE>
<LINK title="Text-only version"
rel="alternate" href="text_only.html"
media="aural, braille, tty">
</HEAD>