Try clicking on the scissors icon in one of the toolbars. The TAB key will advance to the next toolbar but SHIFT-TAB won't go to the previous tab. This fails on Safari Version 4 Public Beta (4528.16, r41944) on Mac OSx 10.4, and Chrome 2 beta on Windows XP SP3, but works on other browsers, so is presumably a webkit bug. I couldn't get nightly to run on my machine so didn't try it there.
Created attachment 32140 [details] demonstrates the problem using HTML and scripting without Dojo code I have created a stand alone HTML test file that does not require Dojo
Note that in the attached example file, if you just change the tabindex to -1 rather than removing it, then shift-tab works fine. However, I still believe this is a bug, I should be able to remove tabIndex and then add it back.
Seems to be working okay now. Becky?
Yes, it does indeed seem to be working correctly 4 years later ;-)