We\'re currently developing an HTML 5 app for the iPad and looking for a method to prevent the screen from going to standby/sleep. I understand this is possible with a nativ
Standby/sleep modes are rooted to the OS, so it's pretty much impossible to achieve with HTML5.
Why would you do this anyway? Maybe you could think of a timeout function in case the device was in standby/sleep and came back. This answer looks useful but I haven't yet test it.