What conditions must be met for iPad/iPhone hardware accelerated animations?

I'm just wandering what I must do to get hardware accelerated animations ? Do I have to se doctype HTML5 or can I use HTML4.01 or something similar ? Are there开发者_StackOverflow any other limitations / things I must do/use?

Also, where can I find a list of css properties (animations?) that are hardware acceleratedon iOS ?

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Opacity and translate3d are hardware accelerated, pretty much everything else isn't. This changes in iOS5