Today I as looking into using HTML 5 databases on Android and iPhone. It turns out that the Android browser doesn’t seem to support window.createDatabase at all. It may be that it does work with Gears or something, but I didn’t try it.
What I did find, when enabling the developer menu for iPhone Safari was that in the 2.2.1 firmware, a user can view the databases that are currently stored on their device in the web browser by domain and delete them.
In the detail screen, it shows you how much data is currently stored in it, and it has a max, which appears to be stuck at 5 MB. I wonder if Apple has plans to improve the mobile Safari dev environment to allow for richer web applications at some point in the future when the AppStore revenues have died off a bit.
Actually I did figure out that the G1 uses gears, so I guess they are equal, but gears doesn’t seem to care too much how much space I can use. I haven’t tried the WorkerPool, or the local caching stuff, but I found another blog where the guy had an icon on his screen for a web-app.