Alpha 4 appears to have a problem with the back button where it does not return you to the correct page. I only see the problem on A-grade devices (including the iPhone Simulator and Android emulator targeting 2.2), not in desktop Safari.
This set of steps should return you to the "Anatomy of a page" screen, but it returns you to the main docs page.
The alpha 3 docs don't have this problem.
I just tried this on an iPhone 4 (4.2) and Moto Droid (2.2) and the navigation works correct with both the OS back button and the toolbar back button. Can you try to reproduce on a device? Might be an emulator issue.
I reproduced it on a Nexus One (Android 2.3.3) using the following:
At this point, jQuery Mobile appears to receive another tap on the "A" list item. It tries to load the page but fails.
I could not reproduce the issue on an iPhone 3GS (iOS 4.2.1).
I checked in a fix for this see issue 1331:
Thanks! I'm not seeing the issue anymore as of d43bbfc.