DrDoc - 9:14 pm on May 8, 2006 (gmt 0)

Place a separator character, such as a pipe, in a <span style="visibility:hidden"> tag. The <span> tag will prevent the character from being displayed on screen. However, in browsers that need the separator character, it will appear since those browsers generally do not support CSS. That makes it possible to meet the accessibility need without impacting design, and the accessibility check will accept this technique.

That may be dangerous advice, as it assumes accessibility only between CSS and non-CSS environment, completely discounting the affects it would have on screen readers etc.